[doughboy]

Originally Posted by Sparky68

Have seen the 335i running 500+ wBHP on stock internals. There would need to be something already wrong with your car for the JB4 to do any damage in my opinion [have a read on the n54/n55 threads]
http://www.e90post.com/forums/forumdisplay.php?f=58

The single turbo conversion guys in the US are running 700bhp+ on a totally standard engine and gearbox, and that's drag racing too which is harder on the car than road use.

Uprated clutch and halfshafts is about it.