Base 6 Speaker Upgrade ???

[co50te]

Looking for some guidance here on how I can install a rockford fosgate punch powered sub I want to pull out of one of other vehicles. That vehicle was very simple with after market radio and harness and not too many electronics. Have resources to help do the physical work but I am having trouble tracking down any information about a harness/tapping into the factory head unit. Any help would be greatly appreciated.

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[SSuperDave]

I added a scar audio 8-in woofer and 350 watt amp to my six speaker car. It was very straightforward and pick a signal up from the right rear speaker using a line output connector. The biggest hassle was removal of interior trim to run the power wire from the battery back to the amp. I fastened the amp to the back side of the right rear seat to keep it up out of the way. I have got to say that it was an incredible addition to a lackluster stereo and I am very happy with it.