Scott, I found the easiest way of adding a quality sub was just putting a 10" or 12" box in the engine storage compartment. It offers you an unlimited selection of subs and amps and you get to use the highest quality components. I have a 10" Polk Momo with 300W RMS. I have plenty of bass and the system sounds good. For comparison, I have (1) 12" Kicker Solobaric L5 with 600W RMS in my SUV. I probably only run it at 20% because the bass would be too much otherwise. The draw backs are: decrease storage space and slightly muffled sound. I do notice an improvement in SQ when I open one of the sunpads. This year's winter project is to remove the port side cooler and cut a 9" hole in the fiberglass so I can mount a free-air sub. I need the storage space for ballast that I'm going to put in on both sides of the engine.