Independant tests of the Ractive cone filter on a 1275cc Austin Mini Cooper showed that the filter decreased HP and TQ numbers slightly. I would not trust their products. Save your cash and get a PR or HS CAI.
i have not really noticed a diff in my filter, its an offname brand typical cone, and like.. i put my mouth to it, and breathed through it, and there was like.. no resistance at all.. i tryed breathing through an injen filter once, and it was actually some resistance.
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