Hey i was looking at the GT Camshafts and thought about buying some. The thing is i only have headers and a CAI . I was curious if camshafts need supporting mods first ? And would it be more worth it to put off the camshafts until a PCM and pulley,in terms of power wise ? On zzp it said gains 20-30hp depending on your set up. Please help me out here ! Thanks !![]()