Chaps, I've got a 1983 S3 diesel with a rotten exhaust, which I need to replace for the MOT. I've been told the system I need depends on whether it's a 3 or 4 bolt manifold, mine is supposed to be 3 I think based on the year? Well I had a look and there look to be 4 bolts holding the manifold to the engine. I looked up the engine number and it is a 5 bearing diesel. Any advice?