I agree with the WHP levels given by MisterF80M3 for E30 and E85 on stock turbos.
The advice from Chris@VTT is spot on. I knew I would eventually do a custom Paul E85 tune and big turbos, so I did the Fix+CBC from the start. If I had planned to stop at Stage 2 OTS then I should have added just the CBC and beaten up the car BEFORE tuning, so warranty could cover me.
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'18 F80 Base 6MT | '19 F82 Exec DCT | '18 F82 Comp Exec DCT | '23 G80cx
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