I'd like to do some mods to my 98 Sportsman 500. What is the best exhaust setup for the money? Do I have to rejet for it? Should I install a complete Heelclicker setup or just change a clutch spring? Is there anything else I should look into adding while I'm at it? This is mainly used for farm and livestock work but is going to be used for some recreational fun at the dunes from time to time, because my son just got a Polaris Predator 50. Thanks for any advice.