i would put a K&N anyway, just remove the oils prior to installing, I did that and have yet to have an issue with it. MAS is good and sound and pick up is great....No different than using those $300+ cone filter intakes since they dont use oil either. Probably the vacum pressure in the intake and the restrictive flow of the stock filter is causing this.
If the intake tube is plastic, it could be flexing during full boost on the vacum end of the intake tube.
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