The only BMW I'd recommend for drifting is the Z4 M Coupe. And the Chevy SS has 6 gears after the level 3 drivetrain upgrade. I'd recommend it for wheelies though.
The gearbox is only partly the reason why you can get power to the road. It's a 30:40:30 split between gearbox, tires and suspension. These are the three elements of a car that influence the traction and acceleration of the ride. You take one out of the equation and it melts down into nothing. Your ride will be worthless.
[Edited by Chingy42007, 1/4/2008 1:55:50 AM]