This PROCOM Performance CDI for the Polaris Predator 500 (03-04) increases the rev limit 1,250 RPM over the stock (from stock CDI 8,750RPM to Procom CDI 10,000RPM). In addition, this unit offers a re-mapped timing curve which yields a noticeable increase to horsepower and torque over the stock CDI. This CDI box is a direct plug in replacement CDI. Simply locate and remove the stock CDI, and plug the Procom unit directly into the wiring harness, no modification needed. Suitable for stock and modified machines. We cover all our PROCOM Performance CDIs with a full one year warranty.