Impala - 2007 - Factory Head Unit - Add Amp and Sub

[thowle]

Hello,

I'm seeking some information.. okay, in hindsight that just sounds weird... anyway, I need a little help from the car audio gurus (you guys)!

I've got a 2007 Chevrolet Impala LT, factory head unit w/ XM, OnStar, etc.

I want to take the amplifier and sub that I had in my truck and put it in my car, without replacing the head unit in the car.

I was looking at a part called the AOEM-GM1416, which is supposed to break out the audio output from the system. See PAC AOEM-GM1416 (aoemgm1416) - Factory System Adapters - Sonic Electronix

Does anyone have any advice or ideas?

Summary:

1. 2007 Chevrolet Impala
   
2. Retain & Use Factory Head-Unit
   
3. Add Amplifier and Sub
   
4. Advice, Guides, Drawbacks, Reviews?
   

Thanks in advance,

Travis

P.S.; I've read some information about people who have used the GM1416 and the output of the factory speakers dropped dramatically. Any review, comment or advice on this? I won't be changing speakers -- only adding an amp and sub.

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