Originally Posted by Arnold K.

I wouldn't do it. The B7 is a generation old, and the interior for such an expensive car isn't that pretty. It's a great car, but carbon buildup is a widespread plague on the 4.2 in the RS4. Take a look at some dynos of the car, you'll notice they dyno about as much as a 370Z does, because of all the build up. The car's performance begins to notably degrade, and since you're looking at a used one, I wouldn't surprised if its already building up carbon.