Just DO IT!
Don't know how true it is but when I bought mine with GMID my dealer wouldn't go a penny less saying they could get in trouble with GM for any other discounts. They wouldn't even throw in a cigarette lighter.....
I had negotiated them down a couple grand and then presented the GMID thinking I was going to get the hellacious deal and the salesman about blew a gasket when he saw the GMID.....
