Fitted decat as recommended. Think I might have damaged the flexi pipe in the process. Just another job to do. Like the mega loud backfire noise on lift off but now have oil blow coming out tail pipes. Will have to do some checks to see if valve stem seals, turbo or pistons are failing. Can only imagine that valves are covered in gunk/carbon due to bad design of crankcase recirculation. Was hoping next purchase would be larger inter cooler, but oil problem will have to be dealt with first.