The first and only official CDI for the honda navi. The rolling wrench CDI is an all in one unit that includes the CDI and coil all in one. The CDI removes the stock rev limiter and lets you set your own or unlock it completely, It also adjusts your ingition of the engine. I recommend to do this last out of all performance upgrades to guarantee your CVT, carb, and everything else on your bike is setup perfectly before changing to this CDI. If you add the CDI with a poorly tuned CVT you will either not take advantage of the CDI and its increased rev limit or itll only marginally improve your top speed but not give you the results you would be hoping for if everything else was tuned right.