Hey man. Thanks so much for getting back to me. Sounds like if you want things to work as normal, like XM and Onstar (which i still use, on occasion) it will cost some serious dough for wiring harnesses and such. Would my steering wheel buttons work too? (Probably another expensive harness, right?) ...

Hey Guys. I have been looking around on the forums here and only bits and pieces of information on this topic. I have an 09 with Monsoon. I would like to upgrade the speakers (maybe the tweeters too, do you think components are the way to go?), the sub, and possibly the amp as well. The head unit is...