I don't know if any of you guys have tried this setup, but I did the following things this weekend and tried it out. The bike now hauls ass BIG TIME!! Huge, Giant Torque off the low end, Brutal mid-range!!If you haven't tried this out, you might like the resulting power increase, if you can hang on! 1. Bike was already uncorked/jetted with the 175 at 600' alt 2. New mod--Remove HRC exhaust tip, the can is now "open". 3. New mod--Install 180 main jet, all other carb settings remain the same (b3e needle 3rd position, etc.) 4. New mod--Drill numerous 1/4" holes in the airbox to improve breathing (backed by a riveted-in screen) 5. New mod--Mix fuel, 60/40, super-unleaded to avgas 100LL I'm at 600' of elevation, so your jetting may vary. I'm not a bike expert or a racer, but I can promise you that the low-end and mid-range snap from these mods kicks ass, literally! Wick it open and hang the hell on!