I was wanting to use the same excuse to upgrade my exhaust system! I have been really curious about the Supertrapp mufflers for a long time. I personally like the options in the look of the tip and the diffuser discs that allow you to tune the sound and back pressure to what you want. If all you want is loud though - take a look at a glasspack - it's cheap enough that if you don't like how it sounds it's not that big a deal. And I would recommend a high flow cat. no matter what you choose for a muffler. Not that I have any experience with a high flow cat. but it seems like a good idea. Let us know what you come up with!