I wouldn't trust ANYONE who works in a home garage despite how many times or experience they have in walnut blasting. This is a sensitive area in the engine compartment and you never know what can go wrong. I am even hesitant on taking it to an indy shop. I would rather take it to a certified BMW dealer and cough up the bigger bucks. Don't cheap yourself out, you have a BMW and its expected these services will be a PITA to pay.
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