A company called Classic Chambered has started making a chambered exhaust popular in the 60's. For those of you that are too young or can't remember, they are the diameter of glass packs but without the glass that burns out. chambered exhaust were options on Olds 442's Pontiac GTO's and Grand Prix's in the mid 60's. They have a great rumble without the nasty roar of flowmasters. Also they don't make your V6 sound like a Mad Bumblebee Honda. Check out their website www.classicchambered.com for various sizes and prices. You'll love the sound.
Just an FYI
BillyDaKid.

 

Stainless Works makes similar systems for our cars as well...

 

The big difference is Price. $75 for Classic Chambered vs $167 for Stainless Works. Mild steel vs Stainless. Just depends on how deep your pockets are. Sound should be the same.
BDK