The order guide has updated info for the 2008 (and final?) Grand Prix. The most obvious thing I noticed was the elimination of the GT model and thus, the supercharged 3800. Beyond that, just some color changes.
Click print book, then select the model, then Print model or the individual sections to view the info in PDF format.
http://eogld.ecomm.gm.com/NASApp/domestic/vehiclesel.jsp?year=2008®ionID=1&divisionID=7
Click print book, then select the model, then Print model or the individual sections to view the info in PDF format.
http://eogld.ecomm.gm.com/NASApp/domestic/vehiclesel.jsp?year=2008®ionID=1&divisionID=7