This PROCOM Performance CDI Box for the Arctic Cat Prowler 650 (06-09) increases the rev limit by 1,000 RPM over stock for forward gears & 500 RPM over stock in reverse. 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.