With my current setup I have a 3" cutout welded in before the muffler with the factory y-pipe. When I get my LT's I want to run true dual, and I've been told to put and x-pipe in to gain back the lost lowend torque. I want to run cutouts with the new exhaust too, so my question is...do i put the cutouts before or after the x-pipe? What size pipe should I use off the headers also?