I'm pretty sure that engine uses piezo injectors they can be noisy. Ford should have a dept. that deals with RFI maybe your local dealer can help with that. A choke on the power feed may help you if they run parallel to the injector wiring. Diesel have become way complex! Let me know how you like your Lil Tarheel I have one on my Tacoma and it has been outstanding I also have a bracket on my camper that I use and have had excellent results with that too.
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