So here's a story I heard from a guy at the dealership that is a Ford Racing and Roush dealer. I was going to get long tube headers and an off road x pipe. The guy told me headers are a waste of money if your not pushing over 500hp because the stock ones are just fine. He said he's seen very little gains in HP only about 9-14 hp at the wheels from headers. Also he said no to got with a H pipe to stick with the X pipe. Basically told me to stay stock headers and get a X pipe w/ high flow cats from a good dealer like Borla, Magna Flow or Flow Master other wise the x would be to raspy. Any one have any thoughts on this and can you use stock headers with an X pipe with high flow cats?