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The only instances where I've heard of an intake fluttering, regardless if it was aFe or not, was if you either A. Installed the incorrect filter from the wrong year (as mentioned), or if the top of the intake cover wasn't installed correctly, or torqued down to the right spec to avoid any air getting in from the seems. Other than that, there shouldn't be a problem, so I would check, and double check to make sure there aren't any seems that are open that shouldn't be open.
Best Regards,
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