This is not a canoe as I have no affiliation with RoadRace Motorsports. The company is introducing aftermarket products for the 500:
http://www.youtube.com/watch?v=Dl-2vWKNkng&feature=feedu
Including a rather anemic-sounding exhaust system:
http://www.youtube.com/watch?v=FqtZrYZ4oFE&feature=feedu