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I've talked to a Whipple owner and he said his car is getting 9 psi, even with headers. Car (M6) showed 612hp on the dyno; the same guys dyno tested my stock A8 at 395hp for some reference on what that number means. His car is tapped out on fuel supply (regular SS not a 1LE) so my opinion is, you should upgrade your fuel system before trying 12psi at low altitude. We are at low altitude here.
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