Quote:
Originally Posted by CosmosMpower
Good review but will still get smoked by a F80 with a tune on E85
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Agree 1000%
This won't transform your car into an M6 or tuned F8x for that matter. You could go Pure S2, etc and get 500 WHP. That isn't the goal with stage 4.
It does (according to the few who have driven both) get you to stock M3/4 numbers which by most accounts, is quite fast.