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mine does this, louder with a CAI, it comes from the iac sensor on the back of the tb where the air is bein sucked through a small hole 1/8" and the sound echos through the tube of a CAI

side note, you really need the first 02 sensor, its the 2nd or after cat 02 sensor that doesnt have to be in, the first one is what reads a/f ratio and w/o it ya may run really rich
 
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