Oh Im doing springs and retainers. Yeah I know its not that agressive, but This is my daily driver, and I really don't want/need anything faster than Low 13's if it dosn't turn like a lambo. The VS cam can put down some numbers too right? It just takes a little more modding. I travel A LOT and gas mileage is a big deal for me. The XP still tempts me though but on unported heads? being driven all over? I don't know. Whats the power differencs between the 2 assuming just my current mods, and headers?