The stock 07 runs pretty good, but I notice the 4-5k rpm (lean) flat spot with spirited riding & at track days. Added the Akra-Ti exhaust with baffle left in. Initially snorkle removed from airbox, and I tried a couple of re-flashes. Could not get 'em to tune for 87-octane regular, so I decided it was time to tune it myself.   Then Hord Power showed us the dyno runs of his "airbox" design.     Dyno chart of airbox +yosh exhaust + PCV ...     I had to have one & tune for it! Air