Since before purchasing my XR650R SuperMoto 2 years ago I had always heard on how much of a "Monster" the bike was. I have a friend that I always ride with that has a 2000 DRZ400 that's tarded too and every time we ride together I can never get away from him. My gearing is 15/42 (from what I know), and his is 15/39. My bike was supposedly uncorked, has a K&N filter, but does not have the airbox mod. Could that one mod really make that much of a difference. And for those who may say maybe he's just a faster rider, my bike was on the limiter in 2 or 3 gears straight. The only time that I know I'm faster is on a VERY long straight where I'll walk by him. And I'm talking a 90 yr old with a walker. Advise?!?!? Shouldn't my bike be spanking his?!?!?