Drive conversion? So, I recently bought an old (1987) Audi 4000S in poor condition. This car is badged as a CS so I assumed it was a CS considering it was a manual and I was unable to get the hood open at the time. I managed to get the hood open and got the surprise of a 1.8 liter engine. I was wondering if anyone had any advice on converting the 4000S to AWD?