I've had the Coffin muffler for a while now, and very happy with it. I got it installed at a local muffler shop in stockton cali. It was something different from what everyone else had, which is always good as far as I'm concerned. It seems to give a V6 a nice rumble. Might be a little loud for some, but seems just right to me.
Idle is pretty quiet, but when you gas it, no doubt you'll hear it. At highway speeds it's just a lil louder than stock.
The link. http://www.thecoffinmuffler.com/
Here's some vids...