Hi, I have been toying with many ideas on how to improve the sound in my 05 a3 sportback. I was thinking of replacing the rear speakers with 2 6.5 subs, and then removing the boot sub and putting a amp to power the fronts and rears in its place. Would this work? And what would I need to get thus working? Want a stealth type install whatever route I decide to go down. Im sure there are many pros and cons to this idea, any advice or guidance would be much appreciated.