Why would you want to quiet them down?!? They sound great loud. There are two rivets holding the baffles in and they are pretty easy to remove. I took mine out to make it louder, not quieter, so am not sure how easy it would be to put new rivets or bolts in, but I can't imagine its too bad.

My '07 "For three days after death hair and fingernails continue to grow, but phone calls taper off." Johnny Carson