Hey i can tell you that your hi-flow will make 250rwkw's with a GCG HI-flow, they are awesome. My car made 217rwkws on 11psi with the following mods, hi-flow, CES dumps, fuel pump, kakimoto exhaust, hi-flow cat, intercooler and pod. If i had a power fc and injectors and say 16psi maybe it would have made 250 easy. Talk to either APC in brissy or even CES in brisbane, or if you want it from the horses mouth so to speak call GCG.