Looking for anyone whos done a carputer install on the gen2 TL using the STOCK GPS BEZEL. Even if you havent done the install - i'm sure you can answer some of my questions.

I dont have GPS in my car, but have access to the stock bezel. I'd like the carputer install to look as stock as possible.

Questions:
I have the stock Bose sounds system and it sounds great. Am I going to lose the sound quality if I replace the head unit? (moving forward.. I'll be adding a 15" and a 10" to the trunk).

Can I use the stock head unit with a carputer install? I dont have an AUX input. Can I hack it?

Because I'd be using the GPS bezel.. I'd have to take the knobs/buttons out for the A/C. Can these be connected to the carputer?

Thx in advance for all the responses.. I've loved this car since I saw it and now I finally have one. You'll be seeing many posts from me as my car continues to evolve.