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In a nutshell, the ECU does the diagnostics on the car, the ABS, the airbag system, and a whole host of other things. For this reason it will not work on anything other than a Cup since the Cup does not have ABS, has half the number of airbags from the MKII, and the diagnostics will all be different. Oh did I mention that the MK1 has a mechanical throttle body and the MKII and Cups have a drive by wire. Yet another incompatability.