I'm converting my 650R to supermoto and looking at all sorts of potential mods while it's apart. One thing I'm thinking about is fabricating a pair of new headers that drop down in front of the frame and curl underneath where they would each mate up with a small glasspack muffler (3" outside dia., 1.75" inside, 17" long) which would hang just under the frame. I won't be offroading or jumping, so I'm not concerned about ground clearance (pegs yes, but not under there). I'd weld tips to the back ends of the mufflers to distribute the exhaust just behind my heels. On the intake side, I've replaced the airbox with an open element K&N Xtreme filter, leading to an Edelbrock pumper. Any thoughts?