oh.. i forgot to say this.. I don't know who told you that replacing the head unit voids the warrenty, but that's bunk. I had an O2 sensor malfunction on my jetta under warrenty, and they replaced it no problem. The only thing they will do is say the warrenty is void if they can actualy prove that the head unit caused the problem. Like if you put in a huge ass amp, and you blow out the alternator.