Which controller

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I have an MY05 AUD STi build date 2004. Do I need the SDC1 or 2. If it is the 1, can I fit a 2 to make use of the steering input and the RS232 connection to my M800.
Thanks
Dave
I have an MY05 AUD STi build date 2004. Do I need the SDC1 or 2. If it is the 1, can I fit a 2 to make use of the steering input and the RS232 connection to my M800.
Thanks
Dave