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      10-05-2012, 02:33 PM   #43
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Drives: 2016 M6 Gran Coupe LCI
Join Date: Jan 2009
Location: UK - Midlands

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Originally Posted by Sparky68 View Post
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]
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.
E90 330i 6MT gone. E91 335i 6MT gone. AMG E63 Estate gone. M6GC current...