On my X GSR these are my mods: ACT Clutch, AEM Air Box, ID 1000 cc injectors, AMS Test Pipe, CNT CBE, DW65c fuel pump, 3 port RRE Boost Solenoid and I put out 341 horse power to the wheels with 91. I am also dual map tuned putting out 405 on e85. I have stock intercooler and aluminum upper intercooler piping. I have DD from my house in Costa to Camp Pendleton on e85. I fill up at the Warner/Beach location when I need to before I go to work. I am fortunate enough that there is a e85 location off base about 2 or 3 miles located off the 5 South. I havnt filled up in two weeks on e85 but the power you get from it will blow your mind. I read that it is equivalent to 103 oct. I am personally itching for more power but I myself lack a lot of knowledge on the X. I am constantly reading all over the place about the ECU and the tranny mostly. But if you need more advice on making power hit up Mike W or Rick B from RRE.