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K&N filters are nice but you almost have to get a exhaust and a jet kit to feel the power increase. the clutch kit does help a great deal and i am very pleased with mine. i think HMF pipes are one of the most high quality aftermarket pipes out there, they give you a little more power and also sound great. for the jets, the bigger the number the bigger the hole in the jet, the bigger the hole in the jet them more gas goes through, the more gas that goes through, the more power you will get. when you get a filter and exhaust they will make more or less air flow so you have to change the jet sizes to get the most power out of your 4wheeler. there are some other things that you can do to 4wheeler but these are about the only mods you can do with out getting into the big $$$.