That Mac exhaust will work fine, but the header nuts can be tough to get off without breaking the studs. Lot's of rust breaker, proper fitting wrench and patience. As Hillsy said, you need to do something about the cheap pod filters, find a proper stock air box for it if you ever want it to run properly. If the header pipes are discoloured (blue) you may have problems from burning lean, check the compression. If the PO has hacked the frame up beware.