Quote:
Originally Posted by Papito135
Impossible to gain that much on a stock BMW. Those number are gained probably due to also having downpipes, ecu tuning, boost tuning, exhaust system and maybe a cam.
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With turbo applications you can possibly gain that much from downpipes alone, but more than likely you WILL gain that much from DP's and some type of ECU tune(JB2, SSTT, etc).