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Ok, Just installed my AEM CAI well seems to be ok, engine vibrates a little but nothing major. My concern is when I shut the car off I hear a "whis" noise. I dont know how to explain it next to if say the word (not even a word) whis that is what it sound likes. I have no idea what this could be, all tubes were clean during installation. All bolts put back on, followed the DIY and aem instructions. I am just really at a loss I cant figure out what the noise is. My life story "It worked yesterday, but not today". Any help would be greatly appreciated.

 
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ya thats how its supposed to sound....mine does too....its sounds like a blow off valve sorta...perfectly normal....dont worry

 
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Normal