I did a quick search on eBay, "CM6 CDI" & it gives you all kinds of POSSIBLE options for CDI replacement, as the stock replacement units are either M.I.A. or way overpriced. "CM6" is the spark plug type that the CDI is designed for, which is the plug that the Octane uses. Whether or not these units will be durable in the long run is always a concern, but you can buy 3-4 of them for the price of a stock HPI CDI unit. Hope this may help...This is the route I will try if/when my CDI gives up the ghost. Good luck guys, Its warming up here in Wisconsin, & I'm gettin ready...!!