hi ive just done the egr mod, i blanked it off at the pipe on the passanger side behind the radiator..my question is when i started my car and let it run for a bit an then turned it off i could hear a noise for about 3-4 seconds after it turned off it sort of sounded like a quiet printer sort of thing. i was just wondering if the d22s allways do this or is this something to do with putting the plate in???