Chris, mine is pretty quiet with headers and dual exhaust. The pipes go all the way to the rear bumper. The cab is insulated everywhere, except behind the kick panels. Didn’t think about spraying something there. I had a muffler put on that sound wise, was in the middle not perfectly quiet but not loud either. The headers Y back into one pipe to the muffler then split bac out to the rear. The muffler is pretty close to the rear end. You can hear it, the link is on my signature line.
