Dynomax Super Turbos here. They're the quietest performance muffler I've found.....and I've gotten plenty of compliments on them.

Summit part numbers are 17667 & 17666

Video of Full exhaust - Photobucket - Video and Image Hosting

And here's a WOT track run....nevermind my wife reading incorrect times at the end.

Video of Against Dunster - Photobucket - Video and Image Hosting