I used a muffler off a 2015 Suzuki GSXR 1000 for it. Had to do some measuring but was able to get the muffler shop make me a pipe to connect to it. Will take some more pictures of it later. The sound is somewhere between the stock exhaust and HMF exhaust. Seems to have a deeper sound. Here is the muffler I used. Now have a exhaust I like and don't have to worry about it burning out.
http://www.ebay.com/itm/2012-2015-Su...ZZIpLT&vxp=mtr
David