I have a 2008 Grand Prix gxp and it has the stock double din radio so when your using the navigation with the stock radio it will tell you when to turn on the HUD also show your radio station and what not but I'm looking to upgrade from the stock to a pioneer radio. Will the navigation still show up in the heads up display and the radio station show up in the HUD? Will I need to buy a special cable to make this work? Or is there any other aftermarket radio I could get that would still allow all these cool features to work or am I stuck with the stock?