The RS4 Avant was built by Quattro GMbh and was a 380 hp beast, with a 2.7-liter V6. It was unveiled for the public in 2000 and its production only last 2 years, until 2002. The model was built as an estate/wagon body only, no coupes and sedans were available.
The RS4 was much like the regular Audi A4 Avant, however, the technical features differenced the two a lot.
The car sproted 18-inch alloy wheels with extremely efficient ventilated discs. The car came from 100 kph to a full stop in just 2.5 seconds. The power was transmitted to the road by the all-wheel-drive permanent system and a 6-speed manual gearbox.
The RS4 had a maximum top speed of 250 kph and reached 100 kph in 4.9 seconds.
The interior was different from the A4 due to its sporty Recaro Seats all wrapped up in leather. Other features included a 3-spoke steering wheel and a 170 watt Bose sound system.
Even if the RS4 was a car that shamed a Porsche 911, it was practical as well. It had 390 liters of loadspace and 1250 liters with the rear seats folded.
The safety equipment of the RS4 included dual front airbags, front side airbags, ABS, electronic brake force distribution, ESC and traction control.
Back in 1994, Audi tapped the engineering expertise of Porsche to develop the mad but engaging RS2, a 311-hp station wagon. Its 2.2-liter turbocharged engine was memorable for fierce reactions, big noise, and an uncompromising character. But when the RS2 (C/D, May 1994) concluded its limited run and the Audi 80 turned into the A4, we had to wait five years for the next "super Quattro"-the S4. Alas, that car (C/D, September 1999) somehow didn't seem so mad: 250 horsepower from a twin-turbo 2.7-liter V-6, basically the same powerplant you'd find in the docile and luxurious A6 2.7T. That meant it was quick but also civilized: quiet, easy to drive, not really an Ingolstadt hot rod.
Comes now the RS4 Quattro, the most powerful production Audi yet unleashed, producing 375 horses from its rather-more-stressed 2.7-liter V-6. Cosworth Technology, a division of Audi since last year, has tweaked the intake and exhaust flow to the five-valve heads. What's more, the crankshaft, the connecting rods, and the pistons are beefed up to withstand the larger KKK turbos. The result is a steady 325 pound-feet of torque from 2500 to 6000 rpm.
That stream of power definitely commands your attention. Launched properly, this little wagon claws its way to 62 mph in 4.9 seconds, and the speedo will show 100 mph in a sniff less than 12 seconds. Although a chip limits top speed to 155 mph, Audi's engineers say they regularly saw 179 during testing at Nardo.
Officially, the RS4 is made not by Audi but by Quattro GmbH, the company's in-house subsidiary that assembles cars to custom order. Alas, no RS4s are headed for America. The car's short life span means that the cost of U.S. certification cannot be justified.
At roughly $63,000, the RS4's price in Germany is steep but not colossal, and unlike the upcoming BMW M3-probably this Audi's closest competitor-the car comes as a wagon only, ensuring that golden retrievers throughout Europe will be treated to riveting demonstrations of speed. It's not often you see a wagon with emphatically flared wheel arches and a pair of ducts funneling air to inter-coolers. All the body panels, save the hood and roof, are unique.
Naturally, the suspension is lowered and stiffened, and the enlarged brakes (the front rotors measure an immense 14.1 inches) are state-of-the-art racing versions. The ride is borderline harsh, and the tires sing on anything but mirror-smooth tarmac, but the handling is sharper than any A4's to date.
The old RS2 perpetuated the notion that heavily turbocharged engines had two distinct phases-languid and explosive. Now, however, the RS4's 30-valve V-6 is unobtrusive and silent at low revs, building to its maximum output smoothly and progressively with virtually no lag. Acceleration is effortless in the way of, say, big V-8-powered Benzes, so that passengers are often unaware of the speeds being summoned.
The RS4 is a good car, perhaps a great one, but the passage of time-plus the evolution of electronics-has taken some of the wonder and excitement out of limited-edition hot rods such as this. The RS4 is efficient, quick, and easy to operate, rather than wild, colorful, and delinquent-traits that have imbued Audi's specials in the past.
VEHICLE TYPE: front-engine, 4-wheel-drive, 5-passenger, 5-door wagon
PRICE (Germany): $63,000
ENGINE TYPE: twin-turbocharged DOHC 30-valve V-6, iron block and aluminum heads, Bosch Motronic ME7 engine-control system with port fuel injection
Displacement: 163 cu in, 2671cc
Power (SAE net): 375 bhp @ 6100 rpm
Torque (SAE net): 325 lb-ft @ 2500 rpm
TRANSMISSION: 6-speed manual
Wheelbase: 102.6 in Length: 178.1 in
Curb weight: 3600 lb
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Audi RS 4
The Audi RS 4 is the high-performance variant of the Audi A4 range produced by Audi Sport GmbH for AUDI AG, a division of the Volkswagen Group. It slots distinctly above the Audi S4 as the fastest, most sports-focused car based on the A4's "B" automobile platform. The RS 4 was reintroduced in 2012, based on the A4 Avant instead of the sedan as did the original model.
The original B5 version was produced only as an Avant, Audi's name for an estate car/station wagon. The second version, the B7, was released initially as a four-door five-seat saloon/sedan, with the Avant following a short while later. A two-door four-seat Cabriolet version was subsequently added. Their internal combustion engines are longitudinal and located at the front.
The "RS" initials are taken from the German: RennSport—literally translated as "racing sport", and is the Audi marque's highest trim level, positioned above the "S" model specification of Audi's regular model line-up. Like all Audi "RS" cars, the RS 4 pioneers some of Audi's latest advanced technology. It is only available with Audi's Torsen-based "trademark" quattro permanent four-wheel drive system.
Its main market competitors include the BMW M3, Mercedes-Benz C63 AMG, Lexus IS-F and Cadillac ATS-V.
B5 (Typ 8D, 1999–2001)
The original B5 Audi RS 4 Avant quattro (Typ 8D) was introduced by Audi in late 1999, for main production and sale from 2000, as the successor to the Porsche / Quattro GmbH joint venture-developed Audi RS2 Avant. The vehicle, like its RS2 predecessor, was available only as an Avant and was built on an existing platform, in this case, the Volkswagen Group B5 platform shared with the A4 and S4. Retail price was around DM 103,584. The RS 4 was available for sale in most of Europe, parts of Asia and in some Latin American countries.
Audi produced 6,030 units between 1999 and 2001.
B5 bodywork and styling
Although related to the Audi B5 S4, many of the outer body panels were altered, with wider front and rear wheel arches, to allow for the wider axle track on the RS 4. With unique front and rear bumpers and side sills, and the rear spoiler from the S4 Avant, the aerodynamic modifications achieved a drag coefficient of Cd 0.34. Although the B5 S4 came in a saloon car body style, the B5 RS 4 was only available in the Avant version.
Luggage space, measured according to the industry standard VDA method was 390 litres (13.8 cu ft) with the rear seats in the upright position, and 1,250 litres (44.1 cu ft) with the seats folded flat.
The engine was developed from the 2.7 litre 90° V6 'biturbo' used in the B5 S4. It displaced 2,671 cubic centimetres (163.0 cu in) and had five valves per cylinder. The parts code prefix was 078 and the identification codes were: early version, 2000 (EU2 compliant): ASJ, and later version, 2000-01 (to EU3 standard): AZR. This engine was developed and manufactured in the UK by Cosworth Technology (now known as MAHLE Powertrain). It featured enlarged intake and smaller exhaust ports on the two Cosworth cast aluminium alloy ALSi7mg cylinder heads, two parallelBorgWarner K04-series turbochargers, two larger side-mounted intercoolers (SMICs), dished piston crowns, stronger connecting rods, larger intake ducting, enlarged exhaust system, and a re-calibrated engine management system. The modifications increased the engine's output from 195 kW (265 PS; 261 bhp) and 400 N⋅m (295 lbf⋅ft) of torque in S4 form to 280 kW (381 PS; 375 bhp) at 7,000 rpm and 440 N⋅m (325 lbf⋅ft) at 6,000 rpm. The engine was controlled by a BoschMotronic ME 7.1 electronic engine control unit (ECU), using a Bosch 'E-Gas' electronic drive by wire throttle. It had multipoint sequential fuel injection, a MAF, six individual single-spark coils and NGK longlife spark plugs. The engine oil was cooled by a dual oil:water cooler and an oil:air cooler.
A six-speed manual transmission (parts code prefix: 01E, identification code: FDP) (gear ratios—1st: 3.500, 2nd: 1.889, 3rd: 1.320, 4th: 1.034, 5th: 0.806, 6th: 0.684), cooled by a NACA duct in the engine undertray, and Audi's Torsen-based quattro system, using the Torsen T-1 "automatic torque biasing" (ATB) center differential, with a 50:50 default bias were standard. Final drive ratio was 4.111.
The RS 4 has a curb weight of 1,620 kg (3,571 lb). It can accelerate from 0-100 km/h (62.1 mph) in 4.9 seconds, 0-160 km/h (99.4 mph) in 11.3 seconds, and 0-200 km/h (124.3 mph) in 17.0 seconds. The top speed is electronically limited to 250 km/h (155 mph).
B5 brakes, wheels and tyres
Brakes were also developed jointly in house by Audi's quattro GmbH, not by Porsche as with its predecessor, the RS2. At the front they were radially vented and floating cast iron discs, 360 mm (14.2 in) diameter and 32 mm (1.26 in) thick, with double-piston floating calipers, and at the rear 312 mm (12.3 in) by 22 mm (0.87 in) discs with a single-piston floating caliper. The RS 4 needed less than 50 metres (160 ft) to come to a full stop from a speed of 110 km/h (68 mph).
The standard wheels were 18 inch alloys (8½×18" "9-spoke"), with 255/35 ZR18 high performance tyres. Optional "winter" alloy wheels were also available, at 18 inch (7½J×18"), with 225/40 R18 92V tyres.
Other B5 notable features
B7 (Typ 8E, 2006–2008) 
|Second generation B7 (8E)|
Audi RS 4 sedan (B7)
|Body style||4-door saloon/sedan,|
5-door Avant (estate/wagon),
|Platform||Volkswagen Group B7|
|Related||Audi B7 A4|
Audi B7 S4
|Engine||4.2 V8 FSI|
|Wheelbase||2,648 mm (104.3 in),|
Cabrio: 2,650 mm (104.3 in)
|Length||4,589 mm (180.7 in),|
Cabrio: 4,555 mm (179.3 in)
|Width||1,816 mm (71.5 in),|
Cabrio: 1,814 mm (71.4 in)
|Height||1,415 mm (55.7 in),|
Cabrio: 1,391 mm (54.8 in)
|Kerb weight||saloon: 1,650–1,680 kg (3,638–3,704 lb),|
Avant: 1,710 kg (3,770 lb),
Cabrio: 1,845 kg (4,068 lb)
|Predecessor||Audi B5 RS 4|
|Successor||Audi B8 RS 4|
There was no RS 4 built on the Audi "B6" platform that served as the basis for the Audi A4 between 2001 and 2005. However, after a long hiatus, the second Audi RS 4 quattro (Typ 8E) was built on Audi's "B7" A4 platform, by quattro GmbH in Neckarsulm, Germany. It was unveiled in February 2005 at Audi's 'quattro Night' celebration at the company headquarters in Ingolstadt, Germany.
The RS 4 became available to European customers in mid-2006. It was introduced at the 2006 North American International Auto Show in January, and arrived in June 2006 in North America. The production run of the B7 RS 4 was 2006 to 2008 inclusive, although only 2007 and 2008 model year were sold in the United States. To date, approximately 10,000 B7 RS 4s have been built, of which around 2,000 are in the USA.
The B7 RS 4 Cabriolet was sold in Europe from late 2006 to 2008. It was also available in the US in limited numbers per year and sold at a premium of $2000 over the list.
Audi factory numbers indicate that the B7 RS 4 saloon can accelerate from 0 to 100 km/h (0 to 62 mph) in 4.8 seconds, and arrive at 0 to 200 km/h (0 to 124 mph) in 16.6 seconds. Most European magazines recorded results in line with the November 2009 comparison of "ultimate sedans" in Road & Track, which recorded a 0 to 60 mph time of 4.5 seconds. This is consistent with the pattern of conservatism that is usually found in Audi's official performance numbers. For the Avant, 0 to 100 km/h (0 to 62 mph) is reached in 4.9 seconds. Top speed for all variants is "officially" electronically limited to 250 km/h (155.3 mph), though some owners have reported that the speed limiter is rather "liberal" (which conforms to the pattern of previous Audi "RS" cars), observing top speeds of 270 km/h (168 mph).
B7 bodywork and styling
The B7 RS 4 is an almost complete departure from previous Audi "RS" cars, as it was initially available as a four-door five-seatsaloon/sedan; with a five-door five-seat Avant (estate/wagon), and two-door four-seat Cabriolet (convertible) versions arriving later. Only the Audi RS6 had taken this similar route (saloon and Avant) before; the previous RS 4 and RS2 were available exclusively as Avants.
Constructed from fully galvanised steel in a monocoque (unitary/unibody) design, the B7 RS 4 uses lightweight aluminium for its front wings (fenders) and bonnet (hood). The saloon version features a drag coefficient (Cd) of 0.31, from a frontal area of 2.17 m2.
Like its B5 predecessor, visually, the B7 RS 4 differs from its related B7 S4, by having even wider flared front and rear wheel arches (fenders), to allow for a wider axle track. Over the B7 A4, it also includes two larger frontal side air intakes (for the two additional side-mounted coolant radiators). The trim on the saloon and roof rails on the estate are chrome as standard but can also be found in black with the addition of the Optic Pack which includes a black front grill, all exterior trim, and black roof rails on the estate version. The B7 RS 4 also includes an optional adaptive headlights to complement the standard "Xenon Plus" (Bi-Xenon) High Intensity Discharge (HID) headlamps, which swivel around corners in conjunction with steering wheel movements. Also standard are daytime running lights (DRLs), found within the main headlamp housings, identical to its related B7 A4 and S4, and use a conventional tungsten filament bulb. An acoustic parking system with front and rear sensors is also a standard fitment. Unique carbon fibre interior trims, along with a lap timer within the central Driver Information System (DIS), aluminium pedal caps and footrest, and RS 4 logos complete the look.
In the saloon, luggage space, measured according to the VDA 'block method', is 460 litres (16.2 cu ft) with the rear seats in the upright position, and 720 to 833 litres (25.4 to 29.4 cu ft) with the seats folded flat (dependent on specification). For the Avant, 442 litres (15.6 cu ft) is available with the seats upright (under the retractable load cover), and 1,354 litres (47.8 cu ft) being available with the rear seats folded flat (loaded to the roofline). Kerb weight of the saloon variant starts at 1,650 kg (3,638 lb) (dependent on specification).
A Bose ten-speaker sound system, with 190 watt output and automatic dynamic noise compensation (which replaces the 'GALA' found on earlier units), with "Concert II" radio and single CD player is standard in car entertainment (ICE) equipment. Factory fitted ICE options to complement the standard BOSE include the "Symphony II" system which features twin radio tuners, a single-slot loading six-CD changer, and a cassette player all integrated into a double-DIN sized unit. Navigation option is the RNS-E "Audi Navigation System plus" DVD-ROM GPS satellite navigation, which includes a folding widescreen 6.5-inch screen, two SD-memory card readers, and MMI-like logic control.
B7 interior safety
To achieve maximum body stiffness with controlled deformation crumple zones, the B7 RS 4 features laser beam welding of major seams of the high-strength steel body shell, which helps improve overall structural rigidity, particularly in the "passenger cell", over traditional spot welding methods.
Two-stage driver and front-seat passenger frontal airbags are standard, as is Audi's "side guard" head protection curtain airbag system. This latter system completely covers all of the side windows, from the front 'A pillar' to the rear "C-" or "D pillars". The body-hugging Recaro shell-type RS race bucket seats (not available in North American markets), complete with electrically inflatable upper and lower side bolsters and adjustable lumbar support, are constructed so as not to need lower side airbags to comply with European crash safety standards. In North America, the only front seats available are the more traditional Recaro seats (identical to those in the B6 and B7 S4), which include lower side airbags; these were also available as a no-cost option in other markets. Lower side airbags are optional for the standard-fit Recaro rear seats. Front and outer rear seatbelts include pyrotechnic belt pretensioners, whilst all belts include an excess load limit function.
The engine of the B7 RS 4 is based on the existing all-alloy 4.2 L (4,163 cc) V8 from the B6 S4, and shares many parts, and Fuel Stratified Injection, with the 4.2 FSI V8 engine in the Q7. The engine includes new cylinder block construction, and is a highly reworked, high-revving variant (redline at 8,000 rpm; rev limit of 8,250 rpm). The parts code and version is 079.D and the identification code is BNS.
The same engine base was used for the Audi R8 when Audi wanted to build their first supercar. However, the camshaft drive system was moved to the front of the block for the mid-engine R8.
The engine has increased crankcase breathing, a low-pressure fuel return system and a baffled oil sump, to prevent engine lubricant cavitation at high engine speeds and high-G cornering. It has four valves per cylinder (instead of five on the earlier variant) and two overhead camshafts on each cylinder bank (making it "quad cam"), which are driven by roller chains with variable valve timing for both inlet and exhaust camshafts, along with a cast magnesium alloy fixed tract length intake manifold with adjustable tumble flaps (to improve low engine speed combustion). On 98 RON (93 AKI) Super-Unleaded petrol it produces 309 kW (420 PS; 414 bhp) at 7,800 rpm, giving it a specific power output of 74.2 kW (100.9 PS; 99.5 bhp) per litre. Based on a kerb weight of 1,680 kg (3,704 lb), this results in a power-to-weight ratio of 0.184 kW per kg. This engine also produces 430 N⋅m (317 lbf⋅ft) of torque at 5,500 rpm, 90 percent of which is available between 2,250 and 7,600 rpm. (Using lower 95 RON (91 AKI) standard unleaded fuel slightly reduces engine output, and therefore performance, and slightly worsens fuel economy). Exhaust gas escapes through two '4-into-2-into-1' fan-branch alloy steel exhaust manifolds and four high-flow metallic sports catalytic converters, into twin oval tail pipes with integral dynamic silencer/muffler valves. The engine is controlled by two BoschDI-Motronic MED 9.1 electronic engine control units (working as 'master' and 'slave', because of the high-revving nature of the engine), and uses Bosch 'E-Gas'electronic throttle control (also known as drive by wire), comprising throttle device, accelerator-pedal module, and ECU. The ignition system uses eight individual single-spark coils, using mapped direct ignition, with Bosch single iridium electrode or NGK triple-electrode long-life spark plugs. Ignition timing is monitored with the aid of four knock sensors. The engine complies with the Euro4 European emission standards. The saloon version produces 322-329 grams of CO2 per kilometre (g/km), and the Avant starts from 324 g/km.
A 6-speed Getrag manual transmission (parts code: 0A3, identification codes: HLD, JMH) is the only transmission available. The gear ratios are 1st: 3.667, 2nd: 2.211, 3rd: 1.520, 4th: 1.133, 5th: 0.919, 6th: 0.778.
The Audi B7 RS 4 was the only "RS" Audi powered by a naturally aspirated engine until the Audi RS5 was presented at the 2010 Geneva Motor Show. The RS5 also uses a 4.2-litre high revving V8. The RS5 also dropped the Getrag 6-speed manual in favour of a 7-speed "S-Tronic"dual clutch automatic.
Another focus of the B7 RS 4 was on the introduction of the latest development of Audi's 'trademark' quattro permanent four-wheel drive system. This utilised the 'third generation' asymmetric/dynamicTorsen T-3 'automatic torque biasing' (ATB) centre differential, featuring a 'default' 40:60 front-to-rear torque split under normal conditions. Audi stressed that this would result in a more neutral response in corners and a more dynamic driving experience. Also, a more aggressive Torque Bias Ratio (TBR) was used, and set to 4:1, as opposed to 2:1 (and later variants 3:1 TBR) on standard A4. That means that one side of the differential can handle up to 80%, while the other side would have to only handle 20% of applied torque.
Front and rear axle differentials are conventional "open" types, with a final drive ratio of 4.111.
Traction is assisted by way of Audi's "Electronic Differential Lock" (EDL), which is a specific function of the Robert Bosch GmbH ESP 8.0 Electronic Stability Programme system. EDL monitors the rotational speeds of the left and right wheels across an individual axle, and if one wheel should rotate faster than the other (exceeding the pre-defined parameters), indicating loss of traction, or "wheel spin" on one wheel, the EDL applies the brakes to that individual spinning wheel, and thus results in transferring torque across the open differential to the wheel on the other side deemed to have grip, hence traction. Also included in the ESP 8.0 is "Anti Slip Regulation" (ASR)—Audi's name for Traction Control System.
The result of all these features is that under normal circumstances (driving straight on dry or even wet road surfaces) the car never loses traction, even when accelerating at full throttle in the first gear.
B7 suspension and steering
The B7 RS 4 also incorporates Audi's "Dynamic Ride Control" (DRC) "Sports Suspension" mechanism. The dampers (shock absorbers) are made for Audi by KW, and central reservoirs/valves made by KYB (Kayaba).
In the RS 4 suspension, a fluid hydraulic linkage between diagonally opposing front and rear suspension dampers (left front to right rear, and vice versa) is used to counteract vehicle pitch and roll. Lightweight magnesium/aluminium alloy multi-link suspension arms (four arm with virtual steering axis up front, and trapezoidal arm with unequal length track control arms at the rear) locate each hub/brake/roadwheel assembly in a controllable fashion, whilst minimising unsprung masses. Lightweight hollow tubular anti-roll bars are standard front and rear. Compared to standard B7 A4 models, the RS 4 features a 30 mm (1.2 in) lower ride height. An optional "Sports Suspension Plus" lowers the car by a further 10 mm (0.4 in), and marginally further stiffens the damper rates.
Axle track has also been increased over standard A4s; the front widened by 37 mm (1.5 in), to 1,559 mm (61.4 in) and the rear by 47 mm (1.9 in) to 1,569 mm (61.8 in).
Speed sensitive "servotronic" variable-assistance electro-hydraulic power assisted steering (PAS) is controlled from a compact flat-bottomed steering wheel, finished in perforated leather with mock-aluminium trim. The steering rack ratio is 13.1:1, and the turning circle is 11.1 metres (36.42 ft).
B7 brakes, wheels and tyres
The standard brakes on the RS 4 are of two-piece construction. The cast-iron discs are cross-drilled and radially ventilated and float on aluminium alloy disc hubs. The two-piece disc construction reduces unsprung mass and also reduces the transmission of heat generated by the brakes to the wheel bearings.
The front discs are 365 mm (14.4 in) in diameter and 34 mm (1.34 in) thick, and use gloss black Brembo monoblock eight-opposed-piston fixed calipers from the Lamborghini Gallardo but with Red/Silver 'RS 4' logos. These and the transmission are supplied with a cooling airflow directed from NACA ducts located in the engine front undertray.
The rear brakes are drilled, vented and floating 324 mm (12.8 in) by 22 mm (0.87 in) iron discs, with gloss black Lucas-Girling TRW single piston floating calipers with an integrated mechanical handbrake mechanism.
A lighter and more performant "Audi ceramic" front brake system was an option from 2007 model year onwards (and only with 19 inch wheels). It comprised cross-drilled, radially vented and floating Carbon fibre-reinforced Silicon Carbide (C/SiC) composite SGL Carbon discs, 380 mm (15.0 in) diameter and 38 mm (1.50 in) thick, with grey Brembo monoblock six-opposed-piston fixed aluminium alloy calipers. The discs have a much greater tolerance to thermal differences, virtually eliminating brake fade, and have a duration of five times greater than conventional iron discs. The ceramic brakes also reduce unsprung mass by around 50% and thereby improve steering response and overall handling.
A specifically 'tuned' "sport-biased" Bosch ESP 8.0Electronic Stability Programme is standard, and includes Anti-lock Braking System (ABS) and Electronic Brakeforce Distribution (EBD), and Brake Assist (BA). This ESP system has three user-selectable settings: the standard default full protection mode, increased slip mode (which turns off the ASR and EDL), and ESP fully off. A useful feature of the ESP 8.0 is 'disc wiping', whereby in wet weather the ESP system applies the brakes frequently but momentarily. This removes water from the disc and pad surfaces, and helps to maintain the braking performance of dry weather. This operation is undetectable by the driver.
In the UK and Japan, the standard wheels are 19 inch alloy wheels (9Jx19" ET29 "7-arm double spoke") with 255/35 ZR19 96Y XL (eXtraLoad) high performance tyres. This 19" wheel and tyre package was an option for the North American, and some European markets. Factory supplied tyres included Continental SportContact 3, Michelin Pilot Sport PS2, or Pirelli P-Zero Rosso – although many owners have questioned the load-carrying abilities of the Pirellis (from unexplained sidewall failures and dubious dynamic stability), opting for the more durable Michelins at replacement time. A no-cost option of 18 inch alloy wheels (8½Jx18" ET24 "5-spoke design") with 255/40 ZR18 Y XL tyres was also available, and these are standard in North American markets. A winter wheel and tire package was also available as an option, and included 245/40 R18 96VDunlop SP WinterSport 3D tyres.
A direct-acting Tyre Pressure Monitoring System (TPMS) is standard fitment. This system monitors the pressure in all four tyres every three seconds, and when any loss in pressure is detected, audible and visual warnings are given to alert the driver via the Driver Information System (DIS) in a timely manner.
Other B7 notable features
Other notable features to be found as standard equipment on cars for non-North American markets are the smaller, flat bottomed steering wheel (complete with "Sport" button) again selected from the VAG parts bin from the Lamborghini Gallardo like the brakes, however a standard 'multifunction' steering wheel was a no-cost option, body-hugging Recaro shell-type race bucket seats complete with electrically inflatable upper and lower side bolsters.
B7 crash testing
The North American Insurance Institute for Highway Safety (IIHS) crash-tested the B7 RS 4's sibling, the B7 A4, and awarded it "Double Best Pick" for frontal and side crashes—beating illustrious rivals such as the BMW 3 Series, the Mercedes-Benz C-Class, however at the 2012 session of the SOT (small overlap test ) the A4 was rated Poor, rating applying up to the 2016 MY. () 
The Audi RS 4 won Top Gear's Most Surprising Car of the Year in 2005. In 2007, the Audi RS 4 was the winner in the "World Performance Car" category of the International World Car of the Year (WCOTY).
B8 (2012–2015) 
This section needs expansion. You can help by adding to it. (June 2015)
The Audi RS 4 Avant quattro was unveiled at the 2012 Geneva Motor Show and was based on the B8 A4 Avant. The RS 4 Avant uses the Volkswagen MLB platform, and shares the same powertrain as the RS 5 Coupé.
B8 bodywork and styling
Compared to the related B8 S4, the RS 4 features larger bumper air dams and features double exhaust tailpipes compared to the S4's double twin (quadruple) exhaust tailpipes. Wider arches allow for a wider axle and wheels. A completely remodelled front bumper cover with honeycomb grill compared to the standard A4 and S4 as well as remodelled rear bumper with honeycomb detailing and minor air diffuser.
The interior is largely the same but the flat-bottom steering wheel is covered entirely in perforated leather with RS badging on the steering wheel and gear stick. The interior dashboard and door liners are also detailed with carbon fibre inserts as standard although there were options to change this to aluminium or piano black.
SuperSport seats covered partly with leather part Alcantara were standard in the B8 RS 4 but as with the B7, there was a winged backed bucket seat option. It was also an option to order the seats covered entirely with leather.
The RS 4 is powered by a 4.2L FSI V8 engine producing 450 PS (450 PS; 444 hp) and 430 N⋅m (317 lbf⋅ft) allowing the car to accelerate from 0–60 mph (0–97 km/h) in 4.7 seconds. The RS 4 Avant is available with a 7-speed dual-clutch S-Tronic transmission.
B8 brakes, wheels and tires
New for the B8 are 'wavy' vented and floating cast iron discs, 365 mm (14.4 in) diameter and 34 mm (1.34 in) thick, with 6-pot Brembo floating calipers, and at the rear 330 mm (13.0 in) by 22 mm (0.87 in) discs with a single-piston floating calliper.
The standard wheels were 19 inch alloys with 235/40 R19 Pirelli P-Zero performance tyres. Optional 20" rotor design or 10 spoke alloy wheels were also available with 265/35 R20 Pirelli P-Zero tyres.
Other B8 notable features
Amongst the options available for the B8 RS 4, are ceramic brakes, allowing the car to perform heavy braking without having brake fade.
A sports pack was available which included Sports exhaust identifiable by black exhaust tips in the rear bumper, Dynamic Ride Control (DRC) suspension. The Sports pack also came with the 20" rotor design wheels as standard.
The sports exhaust, DRC suspension setting, steering, engine response, engine mapping, and exhaust note are all adjustable using the 'Drive Select' feature which is a button on either the centre console or through the MMI display interface. Settings that can be selected are Comfort, Auto, Dynamic, or Individual with the Individual setting allowing the driver to select any of comfort, auto, or dynamic for a number of handling and performance options.
A Sound pack was also an option, the main feature being that of the Bang and Olufsen speaker system, uprated from the standard Audi sound system. The Bang & Olufsen system includes 14 speakers and sub-woofers producing 500W.
A total of 7000 units of the Audi B8 RS 4 were built.
RS4 Nogaro Selection Limited Edition
In February 2014, Audi announced a tribute to the original RS 2 Avant on its 20th anniversary by releasing a limited run of the Nogaro Selection Limited Edition. The changes were entirely cosmetic with black trim and roof rails, red brake callipers and blue Alcantara detailed interior (seats, door lining, blue carbon weave elements & blue stitching) as well as the limited edition Nogaro Blue paint exterior. It retailed at approximately 10% more than the standard model.
Some ~200 were manufactured with approximately 39 in RHD being registered in the UK.
B9 (2017–present) 
This section needs expansion. You can help by adding to it. (September 2018)
The new RS 4 Avant was unveiled at the 2017 Frankfurt Motor Show. Noticeable changes to the B9 included a more angular exterior and newly designed wheels. The new RS 4 Avant is powered with a 2.9 TFSI V6 twin-turbo engine producing 450 PS (331 kW; 444 bhp) and 600 N⋅m (443 lbf⋅ft) of torque.
Unlike the B8 RS 4, which had a 7-speed dual-clutch S-Tronic transmission, the new RS 4 Avant is available with an 8-speed 'Tiptronic' automatic transmission.
Speed World Challenge
The B7 RS 4 was planned to replace the C5 RS6 in the SCCA Speed World Challenge, but after Champion Racing had prepared the car, it was decided not to compete in the series, due to rule changes imposed by the Sports Car Club of America (SCCA) on Audi concerning 4WD systems, wheels size, and engine power output. Rather than scrapping the fully built Speed World Challenge RS 4, Champion and Audi used the car as a part of the American Le Mans Series Vitesse Program, which highlights the technology link between race cars and conventional series production road cars.
Six RS 4s are openly campaigned in the Superstars Series by Audi Sport Italia. Audi RS 4 Quattro driver Gianni Morbidelli won the 2007 and 2008 championships.
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