This Programmable PROCOM Performance CDI for the Honda TRX450R (06-10) allows the owner to adjust both timing and rev limit. It is ready to be installed and used right out of the box. All of the preloaded settings on the box provide a 500 RPM increase in rev limit over stock, and comes with 9 different preloaded timing curves that you can select by turning a switch dial on the unit. This Procom Performance CDI has a built in USB port and it comes with Windows software which is very easy to use. Using this software you can adjust timing within a +32/-10 degrees of stock timing at various RPM points and set the rev limit at any value to create a custom map. And it is very easy to switch the unit back to the factory stock condition. Procom also provides its 9 preloaded maps available for download on http://www.procomeng.com 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.