Im curious what everyone who has one thinks of them. Im intrested in a CDI myself but I dont know what the difference is between the ECU and the CDI. The two i've been looking at are the dynatech and copperhead. I want it for my 2008 700. I have a clutchkit(not installed yet) and am running 28" swamplites. Thanks for any advise/info. I know a little about them like they advance timing and help with low end lag and mid range response but id like to make sure i understand them before i purchase one. Thanks.