Audi AG high performance is written all over the Audi RS6 which was manufactured for limited time scales only. Available in 2002-2004 and relaunched in 2008, the Audi RS6 comes in two body styles, five-door estate/wagon (Avant) and four-door saloon/sedan, powered by 4.2 L V8 40V engines.

This powerhouse is capable of a 0-100 kilometer-per-hour (62.1 mph) acceleration in 4.6 seconds, and eventually hit 200 kilometers per hour (124.3 mph) in 16.8 seconds. Top speed has been registered for the Audi RS6 250 kilometers per hour (155.3 mph).

Price Range for Used Audi RS6: $20,000-$37,000
Estimated MPG for Used Audi RS6: 14 City/20 Hwy
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Audi RS6 Test

The Audi S4 is associated with two Audi car generations, first with the Audi 100 variants and the Audi A4 series. In both, the S4 is positioned as the high performance sports version. There are three body configurations for the Audi S4. One is as estate car or station wagon that Audi terms as the five-door, five-seater Avant. Another is as a four-door, five seat saloon or sedan, and finally a two-door, four-seater Cabriolet or convertible.

Regardless of body types, all Audi S4 internal combustion engines are front mounted, orientated longitudinally. The transmission, whether manual or automatic, are placed at the engine’s rear likewise orientated longitudinally as a transaxle. As in other Audi “S” vehicle series, the S4 comes only with the quattro 4WD (four-wheel drive) system. Some Audi S4, however, use the torsen-based, permanent 4WD while other models utilize a transfer-box-based 4WD. Another distinguishing feature of the Audi S4 is its more powerful internal combustion engine.

Base MSRP for New Audi MODEL: $47,100
Estimated MPG for New Audi MODEL: 15 City/22 Hwy
Available Trims: base, Cabriolet, Avant, Prestige
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Audi S4 VS Lamborghini Gallardo

The Audi S5 is the high-performance variant of the A5 series marketed as a compact executive or entry-level luxury car. The S5 has two body styles, as a two-door coupe and as a two-door convertible or cabriolet that will be available as a 2010 model which is scheduled for release in the 2009 fall.

All of these Audi S5 variants sport a 4.2L V8 fuel stratified injection petrol engines that produce 354 PS (360 kW/349 hp) at 6800 rpm and 440 N.m (325 lb.ft) at 3500 rpm. The S5, like most cars in the Audi S and RS series, stand out with their aggressive styling. These outstanding features include a string of LED daytime running lights strategically placed around the car’s bi-Xenon headlights. Larger 19-inch alloy wheels are also standard features of the Audi S5, along with heated leather sports seats, bigger brakes. Some of these standard features are offered as options in the standard A5.

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Audi S5 Vs BMW 335i

Audi S5 Review

Among the high performance cars in the Audi AG stable, the S6 belongs to the A6 series where it is marketed as a mid-size luxury executive car.

The Audi S6 first graced auto showrooms in 1994 and was only different in new badging and body cladding from its immediate predecessor the C4 variant in the Audi S4 series. The C4 Audi S6 was available both as an saloon/sedan and an Avant or estate/wagon, featuring a 2228 cc turbocharged in-line five-cylinder petrol engine, delivering a top speed of 235 kilometers per hour and acceleration of 0-100 kilometers per hour (62.1 mph) in 6.1 seconds. Subsequent improvements were made in the C5 variation of Audi S6 launched in 1997, enabling the vehicle to achieve a top speed of 250 kilometers per hour and acceleration of 100 kilometers per hour in 5.7 seconds.

The latest Audi S6 is the quattro model with an even faster acceleration of 100 kilometers per hour in 5.2 seconds.

Base MSRP for New Audi S6: $76,100
Estimated MPG for New Audi S6: 14 City/19 Hwy
Available Trims: Avant, Prestige
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Audi S6 Road Test

The Audi S8 is known in the market as a large luxury executive car that belongs to the A8 flagship cars of Audi AG introduced in 1997, and is the high performance variant in this series.

Exclusively sold as a four-door saloon/sedan, the Audi S8 is of an all-aluminum monocoque construction and sports as standard the quattro permanent, torsen-based four wheel drive system. When the models of the A8 series had a facelift in 2001, the Audi S8 likewise underwent cosmetic upgrades and came to be known as the D2 S8.

Among other things, engine power was increased further to 265 kW, along with several other enhancements, such as lower front grille trim, chrome-effect beltline and door mirror housings made of solid aluminum alloy. The current D3 Audi S8 has a V10 S8 engine capable of accelerating from 0 to 100 kilometers per hour (62.1 mph) in 5.1 seconds and a top speed of 250 kilometers per hour (160 mph).

Base MSRP for New Audi S8: $10,000-$90,000
Estimated MPG for New Audi S8: 13 City/19 Hwy
Available Trims: 4.2 quattro
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Audi S8 Road Test