Just don't get it off idle.
Let me re-phrase that: any non-sarcastic advice is appreciated!:devillookJust don't get it off idle.
Stumbled across these strange looking contraptions: http://www.thedbsnorkel.com/
Sounds like they might work. Ugly as sin though.
Those are not quite a CR 500 , but Jumby and Ludwig use to run one don't know if it was before last years sound requirements.Talk with the guys that raced them out at Mission a couple of years ago--their bikes weren't too loud.