Scott makes a good point. I spoke to a dealer yesterday who had a yellow SC500 on teh floor. He said that a belt replacement on a year old machine will increase bottom end. He clearified his point by saying that the more a belt gets used the more it will "glaze". The more it is glazed the more rpm it takes to "lockup". A newer belt will lockup at lower rpm which makes it feel like more power. Thinking about how teh PVT drive on Polaris machines work this makes alot of sense.
Take care,

 

I have looked over both the the "plain" '01 500 4x4 and the yeller one. They both look indentical besides color & graphics.