Or you could check your intake elbow and bellows after the air box, and if the leaks aren't there you could do the same smoke test at an indy for half the price of the dealer...
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(Summer) 2001 330Ci - ZSP
(Winter) 1994 530i "Greenie" - PARTING OUT! (PM for details)
(Grocery Getter) 2002 525iT