Same here!
Dynomax super turbo mufflers are being advertised as the most quiet ones in the market.
I don't have any personal experience with them.
Whatever you choose I hope you'll be sharing the results here, for future reference.
I just stuck some plastified insect screen/ wire netting between the cowl openings and the cowl netting.
Cost me less than a buck and works just fine :thumbsup: