After driving mostly domestics, the last one quit on me and I decided it was time for me to get a car I really wanted. So here I am now with an 04 A4 ultra sport, and I love it. After driving it for a while I have determined that I am definitely interested in tuning it up a bit. The first thing is that It was a california car originally, so I absolutely plan on replacing the exaust system, but as far as chipping, etc., any suggestions with who to go with? Phoenix is the closest city with any performance dealers, APR and GIAC are both there???? What to do?