I just put on kooks full length headers and I also have the high flow cats for them, also I have the magnaflow catback system. the magnaflow is way off as far as fitment. I was going to go to the muffler shop in the morning and have them cut up the x pipe but wanted to see if there is any better advice. the magnaflow is evidently for stock manifolds. unless someone in Dallas wants to trade the magnaflow x pipe for one made for Kooks!