It might be the tumble flaps which are in the intake manifold. Use the stethoscope trick to make sure it's not in the valve cover. Mine was dead quiet. Then I put it on the intake and got my sound. Sometime, when I have time, I'll pull the intake manifold and do a write-up about it with video. I've been driving it with the noise for probably about 50k miles.
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Moderating everything now, let me know if I can help.
Originally Posted by the user formerly known as ZX3_Chick
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