I put together a custom exhaust.
It's made from an FMF Megabomb header,
a Delkevic midpipe, and a Supertrapp muffler.

 

That looks goodbut from my experience with Supertrapp exhaust it must be very loud

 

Supertrapps were designed for racing notably dirt racing as they are a legal spark protectors. The number of disks used determines the sound. A typical 300cc race bike uses about 18 disks. I use my bike for daily transportation so I'm running 3.disks. (The 4th disk is a stainless steel end cap liner.)




This might seem really restrictive but is actually FAR less restrictive than the stock muffler because the exhaust exits radially instead of axially.



The stock muffler weighs 8 1/2 pounds, while the Delkevic muffler weighs 4 pounds, and the Supertrapp weighs 3 1/4 pounds.