fran...k.
Husqvarna
AA Class
I got a pro circuit kx 500 pipe and basically cut every weld and re configured it to fit. This gives you a section that kind of loops back on the right side of the bike getting more length like most big displacement two stroke bikes have. It also is significantly thicker and the bike sounds more like a modern bike at least to me. It may take a bit of a husky pipe right at the engine. I can provide some pictures if asked. Moving the large part partially on the basically unused (stock pipe) side allows for a much longer small diameter section before the silencer, which seems to be the modern way things have gone. Looking at large two stroke quad, atv four wheeler etc pipes and what the cart racing guys do when using say a honda cr 500 engine I seem to think there really isn't enough room on a motorcycle.