Help...replacing JBL amp info

[MaxxHavoc]

I've been scouring through the search results and not finding what I'm looking for. Maybe I'm not using the right words in my search.

But what I'm looking for is a DIY or some details on yanking out my OEM JBL amp and installing my 2 Eclipse amps. And using them to power my Infinity Kappa speakers and subs.

I want to keep my OEM Nav head unit. And as much of the factory wiring as possible. I took the cover off of the JBL amp the other day and was encouraged by the inputs coming to it. I'd think it would be fairly easy to get an amp on signal. But not sure about the other signals I need for my amps, like the RCA connections for front/rear L and R. And the input for the subs. Probably just a line out converter? Is there a signal wire that I can convert for the signal to the Sub input on my amps?

I would think the factory wiring from the JBL amp to the speakers will be sufficient to handle the signal from my amps to my Infinity speakers. I don't really want to run all new wires to them from my amp. Anyway any help/links would be cool. I have the system I yanked out of my Corolla just sitting in my garage waiting to into the Camry.