Originally Posted by jturkel

i run 91 octane and have headers, both which lower my boost (less aggressive tune b/c of the 91). i have not gotten a retune since my headers yet though (preheader numbers on dynodynamics = 350whp, 359 wtq). as noted in graph, max boost hit was 18.6 psi. not sure if the number is due to the gas and headers, or a boost leak as Rob of Needswings claims our gaskets leak above 14 or 15 (as many of you know and some have installed these gaskets). So I will be installing the high pressure gaskets to prevent a leak whether i have one or not.