It's really hard to tell from the pictures, Andy, but is the pipe coming out the side modified with welded on metal pipe or is that black plastic or rubber jammed in the side pipe and sticking out at an angle?
That looks like a 300TDI air filter and hose to feed the inlet side of the turbo (with the exception of the extra piece mentioned above).
Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)