Nice set up!!!...I'm thinking of just going with a single 10" or 12" SoloBaric L7 ported with about 880 watts into the single speaker!...and I'm probably not going to upgrade the door speakers cuz I'm happy with it so far...but I do want more "sound"...so I'm probably gonna add to 6x9's just behind the wall (in trunk area) that the stock subs are in to get the "loudness effect".