The Audi TT is a two door, four wheel drive sports car from Audi. The high-end version of this car is the 3.2 Quattro, which has a 3.2 liter engine instead of the base model's 1.8 liter engine.
The first generation Audi TT (pictured above) had a body style with similar-appearing front and rear bumpers, and a very round overall shape.
The second generation Audi TT recieved a more aggressive look, but lost some of the front/back similarity. Its performance numbers were improved as well.
Audi entered the TT in the German Touring Car racing series for a number of years. Pictured below are two examples of the Red Bull team cars.