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Update...
Start and stop engine to see if fuel rail pressure change makes a difference - no. Leave it for an hour over dinner, come back - still same noise. Put it out of the Garage (fear of a fireball engulfing the M3 and Mustang...maybe) for a bit - noise gone. Plug in iCar dongle and start Bimmerlink - no codes. Sounded like it's coming from in the Vee.
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