[HummerNewbie]

I am surprised you don't have the XM Traffic coverage that we have down here. Or maybe I was mistaken but aren't you in the Detroit area? Maybe we have the coverage even though it is a smaller city due to being the tourism capital. I wouldn't spend $50 extra for it if you are not going to get the benefit either. I don't have the part numbers available to me right now but will check on them. The shop you are planning on purchasing from should be able to supply everything you need but you can also PM kodiakz here on the forum and he can get everything for you. He is very knowledgeable and tell you your best options. Don't hesitate to PM me if you have any questions. You have answered so many questions for the rest of us I will do my best to answer any you might have.