I am installing a avic z3 in my 07 avalanche and I can't find the right harness for it. What web site has it I know metra makes it but I can't find a site for metra. I have the premium bose and on star and back up sensor and would like to keep all that is there a certain harness that does all that or is it all seperate. I would like to keep my steering wheel controls as well. is there a built in amp in the avalanche LTZ or is built in the radio because i would like to put that JL stealth box in as well but don't know if it needs another amp. Can anyone help please.
