Dynomax VT muffler

Anybody seen these or heard them? Not much on YouTube, maybe because they're still pretty new. Seems like an interesting design though and might be nice. They are only about 100 bucks on summit racing's site, then another 30 bucks or so for an exhaust tip to put on.

http://www.dynomax.com/mufflers.php?muffler=vt

I think once I put on an intake, one of these would sound nice.

My options are to just put this on, or to get 2.5 pipes put on instead of the 2.25 already on there. OR keep the 2.25 on there and just cut out the resonator. Maybe get a high flow catalytic converter.

Opinions?