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The OEM gasket is adequate at stock boost
Even distribution of cold air across the filter
Made of one mil aluminized material bonded to a woven glass fiber heat resistant matting
Universal fitment -- adjustable to suit a wide range of applications
Reduces compliance-induced geometry variation under cornering and braking loads
PERRIN Lightweight Alternator Pulley - Red 2006-2014 Subaru WRX / 2007-2021 STI / 2006-2013 Forester PDM_air-oil-separators The OEM gasket is adequatePERRIN 06 14 Subaru WRX 07 21 STI 06 13 Forester Lightweight Alternator Pulley Red Matching our signature Crank Pulley design, the PERRIN Alternator Pulley decreases rotational weight while maintaining good looks. Decrease Rotational Mass PERRIN Alternator Pulleys weigh just 0. 116 lbs., which is lighter than the OEM alternator pulley. Throttle response, horsepower, and torque are all increased with this easy to install part. Design Designed to match