After trying to go with a sub enclosure and amp it didn't turn out how I wanted to so my next step is to just replace the stock 8" sub. The factory sub is enclosed in a plastic sealed box and I have less than 4" mounting depth to work with so that narrows my choices down.
I'm probably going to go with the Kicker Comp RT because that only needs 2 5/8" of top mount depth and that looks to be the highest RMS shallow mount I could find. The RMS for that sub is 300w / PEAK is 600w. Could I use my JL 500/1V2 or is that too powerful?