The codemate is the one I bought and modified. The only thing in a codemate is a switch to put the ECM in service mode and a led with a resitor. I mounted my led in the dash so it functions as a check engine light in the normal mode. The way I read it (I'm going to call and check) the $195 is for the cable and the "monitor" software. It doesn't allow any changes to be made as Jim mentioned. The tunerpro appears to be the full blown software for messing up your ECM so it won't run any more!