I agree,the inside & the outside of the cone pull in air.Only cooler air from outside when in motion right,rest of time air from engine bay.I'd cone the whole filter and feed all of its surface with cool air.On the idle speed,the blue tube in your pic is to the PCV system,have you kept the stock size adaptor or is it bigger?,this can effect the idle as the pcv system uses metered air from the maf.Thanks for the info TAH

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