Direct plug-in. Increase RPM. Timing curves advances to gain maximum horsepower. 1-year manufacturers warranty.This item fits the following models: 2004 Polaris ATP 5002003 Polaris Magnum 500 4×42003-2004 Polaris Predator 5002004 Polaris Ranger 2×4 4252003-2004 Polaris Ranger 4×4 5001999 Polaris Ranger 6×6 5002003-2004 Polaris Ranger 6×6 5002003 Polaris Scrambler 500 4×42003-2004 Polaris Sportsman 4002003 Polaris Sportsman 500 6×62003-2004 Polaris …