Originally Posted by 335dFan
Somebody told me a while back that Circle BMW in NJ would do this service, but I have never explored it further. They are located a bit south of Manhattan/Long Island.
Circle has done this for gasoline engines, not diesel. It just seems as the convoluted secondary intake path is hard to get at without removing the head. At least this is my assessment based on not a single example of walnut blasting a diesel with the head on the engine....