Both ecu's bought new will have all the harness disc etc just make sure the company you use are familiar with setting it up on the rollers all emu has over the emb is a few more tables for the mapper to work with ie launch control and top speed delete but you can remove top speed cut using sld or speedo convertor so all you really get for way more money is something that's going to wear the drive train out after a few goes unless your a serious drag slag there's no point in going for it you won't gain any more power they are both just as good as each other for general street driving even track