JWillis is right if you stay on the 8PSI pulley you should be, SHOULD be fine, I made 412 WHP and 320 WTRQ on their "stock" kit custom tune of course. I then went for 500WHP and the motor quit at 457 WHP and 330 WHTQ @ 12 PSI. I was seeing 9 PSI on the stock set up, An I only did the impeller upgrade but had all the fueling upgraded and UPREV mafs. You'll need only the heat exchanger if you plan on staying at 8-9 PSI.
If I could do it all over again I would have stayed t 412 WHP and be still driving it and not looking to buy another one
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda,
