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I held out for years before converting to e85, 93 pump making 750+ rwhp but, last month I opted to upgrade my fuel system to dual pumps and an e85 tune now the car has option A pump gas at the same hp as before or option B very conservative e85 tune making 912 rwhp all with the same hellion twin...

I have the full Steeda set up on my 2017 S550 the NVH is negligible until I did the differential bushings and I used the softer density bushings. This will require an alignment after install and I would suggest a shop that is familiar with these cars and track settings. I have checked my car...