ok, so I've had my Eclipse AVN5500 and door speakers for almost 2 years now and think it's time I actually added some thump to the car. I'm not looking for the kind of amp/subs where I share my music with everyone around me, just more than what I have now. However, I don't want to take up any of the already limited trunk space.
I like the idea of the OEM one that fits under the seat. Will this match up with what I have? Will a dealer still install it when I have an aftermarket head unit? Is there a better solution somebody has already come up with?