As I recently pointed out to someone else via PM...
1). Take a stock used Audi TT 1.8 (NOT the newer car with the 3.2...make sure it's the older one with the 1.8 motor).
2). Take this TT 1.8 to any track, slow it down all the way to a stop, and hold the E-brake.
3). Continue holding the E-brake. Now apply gas. Notice how the clutch engages and the engine starts struggling? This is what any front-drive car in GT would do.
...IF it were an all-wheel drive, the clutch would
not engage, and you'd be able to rev all the way to the RPM limit, as long as you're still holding the E-brake with gas applied. The newer 3.2 car is AWD and its revs can be pushed all the way if you'd like. Not the 1.8
...ironically, in GT2, the Audi TT (there's only one...the 1.8) is an all-wheel drive (Quattro). It does zero to 60 mph in 7.0 seconds. In GT3 & 4, someone over at PD screwed up because starting in this game, the "Quattro" is really a non-Quattro. At best, I think I've been able to make it from zero to 60 in about 9 seconds in either GT3 or GT4, because front-drives don't accelerate from a dead stop as well as all-wheel drives.
...my theory is perhaps PD meant to include both FWD and Quattro versions of the TT 1.8 (there's both FWD and AWD versions in real-life) but somebody screwed up somewhere.
Twice. In both GT3 and GT4.