I'm completely fed up with the Bose audio set up in my S3 so have decided that all the gear I have from my old car should be given a new home. I just have a couple of questions on what's needed to install it before I rip my car to bits only to find that I'm missing a wiring harness or something similar. What aerial amplifier is required? Do I need a special wiring harness for my Alpine HU? Am I better off using 6x9s in a stealth shelf or just upgrading the rear speakers? (I already own 6x9s) What size speakers can squeeze in the front / back and what is their maximum depth? Are any special spacers to fit speakers in the front / back? Sorry for 20 questions and thanks in advance for your help.