The vast majority of racing series in the world have some level of restriction on aerodynamic elements.Take that away, though, and you get truly wild cars, like this Audi S4 from aftermarket shop ...

In order to meet new FIA regulations, Audi downsized the R18's engine to a 3.7-liter turbo-diesel V6, which is significantly smaller than the 5.5-liter TDI V-10 used in last year's R15 race car.

Thus, those willing to pay the S4 premium (at this writing, Audi would acknowledge only a "mid-$40s" starting point) will have 339 horsepower and 302 pound-feet of torque underfoot, compared with ...

Audi S4 B5 - Castrol Syntec Top Car Challenge. Only Days Before The Top Car Challenge Takes Place, We Take A Closer Look At Mike Ghaemi's 700WHP Audi S4. MotorTrend Staff Writer Sep 21, 2009.

New Cars. First Drives. 2004 Audi S4. 2004 Audi S4. Trading turbos for torque. ... Audi had invited no less than Le Mans race drivers Tom Kristensen and Emanuele Pirro to give rides in the pouring ...

Car Profile • Audi S4. Buick LeSabre vs. A45 AMG and Audi S4: Possibly the Strangest Drag Race Ever. Published: 3 Aug 2018, 20:14 UTC • By: Mihnea Radu. 3 photos. Photo: YouTube screenshot.

It's crazy that this type of car has become powerful, ... BMW M340i Crushes Drag Race, Diesel Audi S4 Humiliates Polestar S60. Published: 5 Jan 2020, 16:55 UTC • By: Mihnea Radu.

However, all these small numeric deficits are race- and test-track data and don't reflect what this car is like to live with in the real world. Put the S4 on a wandering back road, and its ...

It's a battle of Audi beasts! In this 3-way drag race, we pit a factory Audi RS4 against a tuned REVO Stage 2 Audi S4, and a completely stock S4. Which one truly delivers on the strip? In this ...