Thanks MattWe have a few options available for you. Check them out here:
Can AM Spyder Exhaust, Air Filters, Juice Box
I can tell you that our SPX15 Performance Muffler has a very nice sound to it. A few people at the Chicago show said it sounded like an Indy car. It has a nice thumpy sound at idle but when you hit the throttle it is louder then stock but not so load that its annoying. Let me know if you have any questions.
Thanks,
Matt