Let me start by saying that you got an awesome car. IT's way more car than the 5th gen.
That said, you are the biggest sucker in the world.
They didn't give you $33,100 for your car. They used some of the $3k markup that you paid to over allow for your Camaro. The sales manager didn't want to have a story to tell either. He just said that to get you to buy.
Paying a markup on any car, especially a GT500 that offers slightly better performance than a 2010 that you could have saved THOUSANDS on, is absolutely retarded.
So, you lost $1500 in negative equity that got added back onto the GT500 note and you paid $3000 over sticker. That's an extra $4500 added on to your car note.
Did they give you a bottle of this to help with the screwing they gave you?