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Not sure if I get this correctly, but doesn't a bone stock Z4M put down 275whp ? What benefit are you getting with headers/exhaust and a tune (not speaking in general, but with your specific vehicle) if you aren't gaining anything significant?
Would it be worth while trying a pull with a stock ECU tune, but same updated hardware?
EDIT: Just missed your response:
Originally Posted by zubydafa
I'm back on OEM flash running 279 wheel on a dyno jet. Evolve can't tune this thing
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