I am looking to replace my stock head unit but ran into a bit of a snag. The local car stereo shop says that the air bag sensors are in the stereo and I will need to spend an additional 70 dollar to replace it. I called Future shop, Best Buy and another local shop and they didn't seem to know much about it. Crutchfield makes no mention of and I didn't see in mentioned in here either. Has anyone heard of GM putting air bag sensors in their stereos?