Pretty nice, numbers OP. Were you running a Stage 1 tune prior? I ask because in the "before" numbers, you were putting down to the wheel what BMW quotes at the crank.
I think running getting a custom tune file for ethanol (e.g., E85) is your best chance of safely and economically hitting 400 whp without a turbo upgrade. Should be easy to swap back and forth with the Cobb when you fill up.
Quote:
Originally Posted by jts1981
Full bolt on, fmic, dp, intake, exhaust(or just oem performance exhaust will do).
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How much is an exhaust adding on these cars? I would be surprised if it's >5 whp.