Ktm changed the mounts for muffler and pipe in 2014. Pre '14 there is an alloy bracket with two bolts into mounting point in tank, then single bolt through muffler. Then they changed the mounting system to a welded bracket, with a elongated type mount for muffler, and an extra pipe mount using lower tank mounting bolt. So you will have problems if trying to use later version (2014-18) wings muffler...the actual muffler is identical, however the wrap around strap is different. The opening in the strap is offset, and wider, from memory.