Wondering if anyone has done any work on the sound system of their vehicle. I'm getting mixed information, mostly about speaker size. I've hear the rear deck of my car (1997 Audi A4 Quattro 1.8T) was a 5", from another source a 5.25", from another source a 6.5" and from yet another a 7". What are the real speaker sizes on this thing?!?! Also, I'd like to replace the head unit on it, but it being oversized, I'm finding that most of the installs available, look God-awful. I want a clean install, is there a way to pull this off? Also, I'm quite new to car audio, perhaps a reccomendtion as to what speakers and headunit to use. I was also pointed in the direction of the Infinity Basslink, to fill in the lower frequencies. Any ideas?