New to this site. Looks like lotsa good info. Have a 02 Sportsman 500 H.O. Only trail ride (never deep mud). Was thinking of airbox vents, rejetting, possibly exhaust and clutch kit down the road. How do the Uni vents work as far as keeping water out, etc.? I believe I'm running a 152.5 main jet. With the vents, I should have to go up to 160 or so? Thanks for your time....Scott

 

I dont think they will make that big of difference , if you want the vents get them and try them before you re-jet, then go up one jet size at a time and read your spark plug.