Hello all. I purchased a 2004 FX35 with the tech and sport packages in 2010 and I always felt like the stereo was great, except there was literally no bass. While randomly searching online today I found out that the stock BOSE system is supposed to come with a subwoofer in the spare tire location. My car doesn't have this. My question is, would it be possible that this wasn't fitted from the factory, or is it more likely that someone removed it? Also, what do I need for hardware to install a new or used unit that I can find on ebay or equivalent? I'm not an audiophile, so I think the stock sub would be fine for my needs and I don't want to sacrifice luggage space with a box.