I run stock cj manifolds (from an IH dump truck). The exhaust goes straight back along the frame rails, the passenger side crosses over to the driver side just behind the transfer case. I run a glasspack just behind the rear axle because that's the only place I could fit any sort of muffler with my link suspension. Points out the back with the turn down welded directly to the glasspack. It's not too loud like this, but I would like quieter if I could. Before the link suspension I had a 94-97 powerstroke muffler ( 3.5" in/out, straight through, stainless) in the normal spot and it was very quiet, I prefer that for trail rides.