so i got a cheap aftermarket headunit. the stock one took a poop. it came with free shipping, the wire harness and installation bullsh*t. so more power to me, nothing wrong with free.

anyways im planning on doing the 70-1858 harness, because its cheap. i read thru this (http://www.grandprixforums.net/radio_install_info.php) a handful of times and im still confused. i NEED the harness to work with the bose right? or can i just use the harness that came with the headunit? and is it plug and play?

thanks