Well boys I got some Long Tubes and a Pro-Chamber H for long tubes on the way next week. First of all do I need the O2 extenders or is that just for the rear o2's on the newer stangs. Also I'm getting these MAC long tubes used and will be needing new header gasket where is good place to get one and do I have to change size from my stock one. And finally I still need new motor mounts. I herd that I'm gonna have to pull the motor mounts to get these headers on, so guess I'll save a lil time and money and get those energy suspension poly. motor mounts on at the same time.