I'm looking at adding a Flowmaster Exhaust (muffler) for my '00 Wrangler and
> am wondering how much of a difference in interior noise the Flowmaster will
> make compared to the stock muffler. I've had Flowmasters on my '88 Wrangler
> (2.5L) and dad's '93 GC which was also a 4.0L, but this is for a TJ.
> Specifically, I'm looking at the 2-Chamber 40 Series (not the Delta Flow).
> Will there be a good amount of interior resonance, and what is
> recommendation...turn down, or just run the exhaust through the tailpipe?
Not the flowmaster but you can hear the Gibson at my site. Interior noise went up a bit for me but the stereo cured that. :)