When you Jet your quad after putting exhaust on it do you just replace one jet? or all of them? And does anyone have any experience with the dial-a-jet kit for polaris trialblazer 250 .. > http://www.rockymountainatv.com/Mach...r=2004&status= Would that be easy to install? and it says i need a snorkal.. would i accually have to have one? or is that for a diffrent model? And does anyone have any experience with chain tensioners? are they worth getting?