How can you hook up an amp to your factory stereo 2007 hhr it has factory amp?

The easiest way is a Line Out Converter. You either splice off the rear speakers or if it was equipped with subwoofer then you can splice into that line. The Line Out Converter just gives you a set of RCAs and then you just hook it all up like normal.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.