I have the 6-CD radio and I needed both kits when I added Sirius after the fact. Parts and labor came to a smooth five hundred bucks and a few cents. That's almost two times the price of the factory installation. However, the dealer installation is indistinguishable from a factory installation. I would not attempt the install on your own. The satellite antenna needs to be mounted in the middle of the roof about 2/3 the way toward the rear lift gate.XCaliber said: