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Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower up to 18HP: Compatible 2.5L, H4, 2008-2014 SUBARU (Impreza, WRX STi, WRX STI, II, III), 69-8005TWR :
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Amazon.com: Compatible with Subaru Impreza / WRX / STI Reusable & Washable Replacement High Flow Drop-in Air Filter (Red) : Automotive
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