Well I'll put in my 2cents here as an owner of a 04 GTO I will say the LS2 is overrated and there is no 50hp difference with just shorty headers a K&N fipk and tune I pull a 12.99@105 with a 1.8 60' I have been up against a stock 05 GTO and we were nose in nose to about 100mph ,I get good 60'with Nitto DR's I also run them on my GP .