Here's a clip from Tom Langdon's site:
GMC noise

This is a 302 Jimmy with headers, long glasspack mufflers as far forward as possible, and very long tailpipes down each side. Tom was after the old-time "RAPPP" sound on overrun.

This sounds a lot like my first 216 with a split manifold and cheap JCW glass packs.I loved the sound then, but the cops didn't. My latest try uses 40" glasspacks, separate tailpipes both down the passenger side, exiting behind the rear wheel. That provides more of a Jaguar/Austin Healey sound, but in a much deeper pitch. No "RAPPP" though..The glasspacks get louder with use though, and I'm ready for something a little quieter. I might add a crossover pipe upstream of the mufflers.

Patrick's new catalog shows a similar system but all in polished stainless and using a single Bassani 2 in/2 out muffler. He actually had a prototype of this on his own truck in Denver a couple of years ago. I thought it sounded a lot like mine, but maybe a little quieter.

[This message has been edited by Jack (edited 08-06-2003).]