For the 08, definitely the pipe. Any pipe! I have a SS DRD and it's has completely changed the whole riding experience. I still can't believe Yamaha in good conscience could let that exhaust ( primarily the silencer) go out the door. A great front tire 773 (sand) For the 06, a great front tire and raising the fork tubes (free!) to 10mm. and a little time setting up the suspension (free again).