i am running a ford truck, weight 3800, have a 460 bored 30 over, edelbrock rmp intake and cam, edelbrok 800 carb, d9 heads that have been gasket matched, bowl blended, 3 angle ground, with a set of tri y headers will be straight exhaust about 4 ft long including magna flow mufflers dumped after the cab have a 4.11 posi rear end, should i go with x pipe or h and what size pipe ?