Many owners have added aftermarket exhaust systems or mufflers to their bike. My Maxim 750 has had the two mufflers replaced twice because they rusted out, but while I was driving on the second pair I had to remove the rusted baffles and boy that was loud! In fact I continued to drive with them for the summer, but after I got a speeding ticket, (the police were attracted by my loud exhaust when I opened the throttle) I decided it was time to get some new mufflers. On my Maxim the "collector" where the four exhaust pipes join is still there, but has rusted through numerous times. My dad has welded it and I plan on continuing to do so because of the high cost of a complete exhaust system(~$400 canadian).