65-408,
I'm running Spintech Sportsman Street mufflers (2-1/2 in/out). It's only a temp exhaust right now.. no x or h pipe yet. If my exhaust guy can cram it in, I'm going for an x-pipe, which should smooth it out a bit.
Right now, with no insulation or carpet, it's pretty loud inside.. but it sounds awesome.
Once the full exhaust is on and the interior is put back together, I think things will be all good.
-Shannon