OK, I just bought a 72 Sebring Satellite. I love these cars for their almost predatory look. My best friend when I was growing up had a Satellite that he's fixed up nicely with a 350 (or so I think, I'm not positive... maybe 330?). Mine has a big ol' 400 inside of it.

I wanted to reproduce the sound my friend's made: I know they were glasspack mufflers, but they didn't quite have that annoyingly loud glasspack BLAT! sound that sounds like a truck downshifting while engine braking.

His had a pleasing kind of heavy rummble, which would crank up to a nice, meaty, throaty roar with just a SLIGHT edge of glasspack sound when he stepped hard on it.

How and where would I find this kind of muffler?
Thanks in advance.