exo128,
If you're serious, then I suggest that you snap a digital photo of the vehicle's window sticker or, alternatively, ask the salesman to give you a complete list of the vehicle's RPO codes, and then post the info here for feedback from forum members.
Don't know about RPO codes? Check out the GM/Cadillac CTS Online Order / Reference Guide. To get started, just click on the model year
2008 or
2009, then click "Ordering Info" > "Equipment Groups" > "With Additional Options."