I'm wanting a slip on exhaust for my Hornet 600. I already have a K&N air filter in the airbox and still have the standard end can, with the standart carb' jetting. I assume that when I fit a race can with the K&N, it will need to be rejetted, right? I don't really want to be paying $400 odd on having it rejetted, as all I'm really after is a good exhaust note. If I change back to the standard air filter and keep the slip on, will it simply run just like it does now? Does this make any sence? Does your brain hurt, too....? Daz.