AS far as I can see from the diagrams I have, it sits directly after the turbo. After this, the exhaust pipes go under the car to the regular silencers etc. It has several temperature senders attached, plus the lamda probe, plus a connection to the exhaust gas recirculation system. So to take a look, pull off the top engine cover and look for the exhaust manifold and then the turbo. Directly after that should be the DPF box in all its glory. Good luck.