Just wondering if anyone has installed an aftermarket stereo themselves? If so, can you (1) tell me what it takes to get the old one out and (2) and most important, what is the correct wiring harness that will still retain onstar function? I looked on crutchfield and it says GMOS-LAN-03, but I cannot find anywhere that says this harness is actually for an 08-10 malibu. I plan on purchasing this on ebay because it is only about $75 but I really don't want to purchase the wrong thing. If anyone knows for sure, I would really appreciate the help. Thanks everyone!