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I wouldn't drop COBB. That would be a big mistake. Take my word for it. I've tried other tunes and I have friend who have them and they bought COBB because we got to compare hand in hand.
I run COBB with E85 and meth. I have the HFS-4 kit. It's a great kit, very high quality. Runs off IDC and boost, and has a failsafe in case you run out of meth.
With a custom tune, you can also tailor the tune to your car and get great result. that's what I did and I'm very happy with where my car is right now.
goodluck
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'07 E92 335i 6MT- HP650, inlets/outlets, ER FMIC, VRSF CP, LPFP stg2, CSF rad, 'is Aux rad, ER OC, Ohlins, M control arms, eibach front sway bar.
'05 C55 AMG
SOLD - '22 Tesla M3P | '10 E92 335i M, 6MT COBB, FBO, st2 LPFP, Mfactory LSD | '07 E90 335i, PTF COBB E50, FBO, HFS4
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