Hello, I am a new member, thanks for having me. I am wanting to put music in my 2009 audi a4 without compromising the trunk space. If possible I rather keep the factory radio and controls, as I am in interested in a little bass and volume ( to sound like I have on beats by dre or 50 cent head phones..lol just to give example of bass and sound I am looking for , but of course I want to be able to hear the music, as well); however if I must put a whole new music system to achieve that I will do so. I have seen where online some have added speakers to the sides ( side pocket) of the trunk which appears to be what I should do , but since I know nothing about music I do not know where to start or whats needed, such as speakers of course, but amp? Tweeters? Etc. HELP PLEASE… Thanks in advance