Amp installation for '96 GP

I'm putting an amp and subs in my GP (first time I've done such an installation) and I was hoping someone could let me know where the best/easiest place is to pass the power cable through the fire wall on a '96. Also, I was wondering if it is possible to lay the back of the back seat down to get to the trunk...I can't seem to find any release that allows me to do so. Any help is greatly appreciated. Thanx.

OK...since I didn't receive any input, I decided to toy around a little this afternoon. First, I found a gromet that passed through the firewall in the upper left hand corner of the passenger side floor board. U cannot see it from the inside of the car, but if u pop the hood and trace the automatic shifter cable to the firewall, u'll find it. I had to pull the gromet out and stretch it quite a bit to get the 4-gauge wire to fit thru w/ the shifter cable. As for the back seat, if u reach along either side of the seat, down low there is a small hole that passes thru to the trunk. Wiring can easily be passed thru this hole. Hope this saves someone else a little time.