why you dont believe??
He live beside me.. and I know his car.. and my car will be tuned soon too.. and there are already 3 g37S tuned at same place where G37Sam did.. all off them got good gains.. Sam got 296 HP the other one got 291 HP.. why?? the answer is bcuz Sam got test pipe. the other dude got HFC..
and dont forget that sam raised his max rev RPM.. his car can rev all the way to 7600 RPM or somewhere around that..and the stock rev limiter is 7200 RPM..
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