for Bub owners, try this, pull baffel, cut prferated tube at the 1/2 way mark wrap some glass just at the back end of perforation and safty wire so it stays put. It will sound throaty and deep,and plenty loud when given the gas but at idle it wont wake the neighbors. Ill be pulling them again real soon so I will take pictures.
()--:::::::::: (representing an uncut baffel) then I did this ()--**:::: the ** represent KTM fiberglass packing. its about 2" in width.