dude have u seen what turbos all the top cars run? Most of the top cars D1 cars run 450ps plus which mean td06-20 at a minimum. The ppg gearbox car and the d1 garage s14 and a number of other cars in the aus series all run highmount turbos. Its quite easy out on a race track to keep the engine on boost as most of the time you are in the powerband (if not change down! ) or you can always kick the clutch