wait.... the stock amp is 240 (4) channel? That's good to know. I was under the impression that it was much less power. Also moving to a 4 ohm Amp from Alpine.

Guy said I would have about 90RMS out of the new infinity speakers I plan to put in the door.

Again, we are going to try the stock amp first. The gist of all my readings say, one channel per door, and 2 channels bridged and wired (correct me if I am wrong because I am truly learning on this thread as we chat) parallel to get 2 ohm proper from the pair of Dual Coil 4 ohm subs I picked up for $30 total. I was trying to save money somewhere and they appear to be excellent quality and fairly basic materials. The Pyles look good too, even though you wont' see them. I am quite happy with that purchase as I have them hooked up to the stock system right now (capacitors still in place in the door).