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precise monitoring of their wideband air-fuel ratios under boost conditions
Engineered to work seamlessly with OEM shocks
The result is a drivetrain that feels more solid
making it an easy and practical upgrade
K&N High Flow Air Filter 2008-2021 WRX / 2008-2017 STI / 2005-2009 Legacy GT SALE_2014-2018Forester precise monitoring of their widebandUpgrade your Subarus performance with the K&N High Flow Air Filter designed for WRX, WRX STI, and Legacy GT models. This premium panel style filter boosts horsepower by 1 to 4 h. p. while maintaining excellent filtration efficiency, helping your engine breathe better and accelerate faster. Its a direct fit replacement that installs easily into your factory air box without modifications. Crafted with multiple layers of oiled surgical cotton gauze, this
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