It all depends on whether or not the baffles / screen are still in place or not. The bulley shaped muffler is definitely more sporty and has a great tone. I tried several different Harley Muffler types and some made Bugsy sound like a rice rocket with a realy, really obnoxious loud fart sound. The bullet shape as Steve got, I have the same type with a straight through pipe, no baffle to plug. A couple of adapters were all that was needed to connect to the stock pipe. And a hanger from the stock muffler lount and it was done. I did tack weld hte adapters together as U bolt did not get them tight enough and htey kept coming loose. No problems since a coule of quick tack welds. No welds, $20 at local muffler shop or donuts.