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I had my car protuned. I don't think I necessarily made more power just the delivery and smoothness of the car is great. The tweaking of the afr and power curve really helped. I do recommend it. I run e20 from the pump daily and 93 at times both protuned want to go back to do a protune of 93/e85.
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BMW 135i Jet Black AT. Hpf intercooler, Hpf exhaust, injen intake, ER competition oil coolers, ER charge pipe, Tial BOV, AR catless DP,BMS OCC, VMR 718s 19s, BMW performance spoiler, agency power rear diffuser, slek lip (on highway somewhere), FXomar abs lip, Ohlins Suspension, All M3 bits, Cobb protuned, turner 3 clutch LSD, Escort 9500ci
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