So, Im going with JBA long tube headers. I have dual cats , single muffler, single out to tip. Im wondering, which one do I use and what placement of these two "cross-overs". Where do I put them, b4 the cats or after? Which one H or X ? Also, which muffler brand and which cats did you get the best years out of? I'm looking to go all out duals to the tips as well. Looking to free up some flow and get a lil more power. Any other suggestions would be greatly appreciated!!