Jamie, Innotec do a 'Turbo Clean Set' which is a kit for cleaning the system in situ. You disconnect the exhaust side if the turbo, blank it off, spray in a gel. Leave it. Spray in a cleaner. Put an additive in the tank and that's it. Minimal disturbance to the system. Try www.innotecworld.com or 01722 411744. We had good results on a Mondeo with early morning overboost problems, Peter