You do realize the that LS1's 1) dyno 280 WHP range Stock. GXP's in the 240-250 range..2) Ls1's Weight less 3439 lbsVS 3600 3) Ls1's have ran high 12's bone stock... Gxp is a 14 sec car. Maybe a high 13 on a perfect run in 20 degrees temps. Ls1's are about a full sec faster http://www.youtube.com/watch?v=a_1RSWcLK6w