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Thanks for the great writeup, protivakid! I am new to the Subie world and to AA capable HUs. I found your write up to be outstanding! I really appreciate the details and the effort taken to not cut any wires and to make the install factory-esque. I have a 2018 WRX Limited with the HK system. Enabling CP/AA on the HU is something I have wanted to do for a while. What is involved in installing a 2019 WRX AA-capable HU into my factory set up? Have there been further development in terms of hardware, adapters, procedures, new learnings, etc to enable 2018 WRX units with CP/AA functionality?
Thanks a lot!
Scott
 
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