Iam running the gamma stage 2 SC kit with the c38-91, I tried renegade fuel at end of summer,it was unleaded 98 octane,iam on the big pulley 7lbs of boost , amazing difference compared to the 91 we have here in Canada,i will be running 109 octane unleaded renegade fuel this upcoming summer, Seb from specialty Z said that it should open the tuning doors wide open with the ecutek,also installing the 85mm pulley, plus cjmotorsports return kit once he gets back to me.
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