Hello, I'm new to this site. I have a 07 RMZ 250, I need some more top end power and everybody seems to say exhaust is a good way to wake up the 250's motor. I was first inclined to go with the yoshi, but now I'm second guessing myself. Any info on Bills would be greatly appreciated, I don't know much about them besides they are supposedly cheaper. I can't even find one on the internet. I've tried ebay, and even on the bills site they only list the DRZ under four stoke. I guess if anything I'll try calling them tomorrow. Sometimes you just have to speak with a real human. wierd. Oh and it would be cool if anyone has any other suggestions for exhaust on this bike. Thanks.