Precision Timing System Allows for 6 degrees retard and 8 degrees of advance timing adjustments. Gives your bike quicker throttle response at lower RPMs. Can also be used to help eliminate pre-detonation (pinging) on some motors. Works with any combination of parts and will make timing adjustments under 2500 rpms. Power Commander 5 can only do above that so this product can compliment the PCV and other fuel controllers. We highly recommend replacing the cam cover gasket at this time. For 08+ Victory engines.