Well aside from the horsepower numbers VowelHater is right. They are really heavy, but even F-bodies don't trap THAT high. Even LS2 C6's are only in the 109-110 range, MAYBE 111 on a great day. 107 is pretty high for an LS1 F-body, so a big ol' GTO isn't gonna come near those traps that you listed, but your horsepower numbers are about right. LS1's make around 310-315 I believe. I know they did with 01-02 F-bodies, but I don't know if GTO's have the LS6 intake... just never bothered to look. As fas as I have seen, on Dynojets, LS2's make around 340-350 at the wheels.