Originally Posted by CO750
Well, the point of the rule is pretty simple. With a fairly restrictive intake and exhaust system you can do just about anything you want to the motor in between and NOT see a big bump in HP. The super techie mechanics amongst us could probably find a way to cheat, but the reality is that with a stock airbox and a stock exhaust cheating gets REALLY expensive.
I'm looking at this as a way to decrease the ongoing costs of racing. Stock motors are super reliable and not prone to blowing up. Being competitive in a class like this is a matter of honing rider skill as the bikes will be, for the most part, pretty equal. So you need a stock exhaust to put back on your bike? Look on ebay. There are a bunch of them out there for most models for under $100.