The problem with the Hookers is they are a larger volume (normal V6 Hookers into a Y pipe at the bottom with a large pipe swooping up to the turbo) with more piping, so you lose heat and velocity, thus hurting your spool up. Your stock headers are better (performance wise) than the Hookers. I would avoid them like the plague. They used to say don;t bother with them until you're into the low 10's, but if you're there by now I doubt you're using Hookers to do it. If you want headers then I would recommend Poston's or TA's. Personally, I just had mine ceramic coated and I love them.