This is the style of muffler I was referring to...
http://www.summitracing.com/parts/WLK-17283/
And I had forgotten about these as an option...
http://www.summitracing.com/parts/WLK-17156/
I actually got to be on a panel to discuss these mufflers before they released them a few years ago. Got paid $100 to show up and discuss + give opinion. Haven't tried them, but pretty cool concept. I am planning to use a pair of Magnaflows on my Chevelle, but a pair of the VT mufflers may be in my future instead.