Facia kit is easy, the Alpine VW facia is by far the best I have come across. It uses the same soft touch rubber as the factory dash surround. Here is a picture of the unit I installed into my Mk6 GTI yesterday: Dash pic
In regards to interfacing, just be careful with overseas integration parts, many that I have tried did not work correctly or caused a few odd problems. I ended up sourcing mine from an Australian supplier for $225.
Let me know how you go with the PAC system, I'm curious to know if it works correctly. What car do you have?
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