[gabe502000]

I recently put a jiangwayne exhaust on my scooter which not only gave an "across the board" power increase, but also added 3 more mpg. Now, this is a 4 stroke engine with EFI , a computer, and all of the whistles and bells, with sensors all over the place. If you put an exhaust on your two stroke Yamaha you'll need to install a larger main Jet in your carburetor to keep from getting too lean and burning something up. There's a forum <www.scooterdawg.net> where they are really into mods and are nice people who will help you. Gabe