Wow. well dealing with my cars(imports). I always thought it was about the weight the power(hp/tq) and the make up of the car's driving style. I'm sure that the gears on an import are very high compared to domestic car. But then when we pick our ratios we know what kind of track we are driving i.e. (8th ; 1320 or street). Take my car everyone knows that the rotary revs high even at stock trim. When built I can take my motor up to 13k easy. So my gears in my car for the track are 5.29. Whats the tranny ratios? Whats the tire size? You have to be a damn engineer to dial in a perfect car. No he doesn't need a 9" hell i'm making 4digits also but I don't weight as much either.