As this has moved to the new audio/nav section figured I would wake it up. I will be trying to put a 10" sub in the factory box at the mod meet. I will say that just doing the sounddeadener on the doors has made a HUGE improvement in the thump in my car. I have been educated. Step one on any stereo upgrade should be quiet the car. You will certainly be pleasantly surprised with the results. Jonymac has the stock stereo with just the sound treatment and it sounds really really good. I have upgraded door speakers and tweeters and the sound is surprising since I did the sound treatment, I get some pretty serious mid bass thump from the doors now.