This PROCOM Performance CDI for the SPORTSMAN 500 (05) & SCRAMBLER 500 (04-08) & SPORTSMAN 400 (05) & RANGER 500 2X4 (06-09) increases the rev limit by 1,000 RPM over the stock rev limit. 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. NOTE: Fits 2004 Model A04CH50AO/AQ/AR/AS/AT/AV/AW/AX and all 2005-09 models listed.