I just got my 04 dvx400. I went to the dunes with some friends that all had Yamaha 450. I quickly saw that I could run with them. I am a new rider, and was keeping up somewhat. I feel if I had a full exhaust system and maybe a Dial A Jet, I could keep up with them. The reason I feel I could keep up with them, is they each weigh 250+ and I weigh only 110. That will be my bonus. I don't necessarily want to beat them, just stay with them. Do you have any tips for the horse power gain. It would bust there chops being beaten by a "girl".