What would you guys recommend I get? I have around $300 right now that I want to spend to upgrade my current system. The system that I have right now is a Boss HU, with subwoofer and preamp outputs, and four Boss speakers(2 6x9's and 2 5.25's). I know that it isn't the best quality setup, but I haven't had any problems with it so far. All I want to do is put a subwoofer in my trunk to give me more low end, without screwing around with the four speakers I already have. If its possible when/if you respond could you put a link to the parts that you recommend are the best bang for the buck that I will need, and have the setup not exceed $300. Also I know that Boss is not the best when it comes to quality, but they haven't given me a problem and actually sound good, I just want a little bit more bottom end. You guys don't have to keep reminding me about my mistake.