Searching for alternative mufflers, I've found this picture of a Chilean QM200 fitted with something called a Pro circuit T4 pipe:





It appears to be made and sold in the US. There are several sites, this one for example:
http://www.partsmag.com/0410/Pro-Cir...cuit-0410.html

There's lots of mentions of expensive words like "titanium", "stainless steel", etc so It will probably cost an arm and a leg.