The 2000 s4 came with a bi turbo 2.7liter from the factory, I rebuilt the car with slightly larger turbos and had the ECM chipped. I got the car for $500 bucks, but was not driveable since the clutch was blown, and needed a lot of work. Kinda been a project car/ daily driver. The GF's car is a 2006 Audi A4 that has the 2.0 liter turbo in it. She just got that one a couple of weeks ago.