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Update
I just noticed somewhat of a low-spot on the front of the intake. I'm guessing the shop used a small surface grinder to remove some of the stubborn gasket material. Both the left and right surfaces look the same, but the low spot is in the middle, right where I would move the new gasket material and have the whistle sound fluctuate.
I very carefully tightened those front 3 bolts (30* at most) and I haven't heard the noise since. Tomorrow morning will be the real test.
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2004 3.4 V6 - 105k mi. - Jan. 2015 AOTM
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