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The aluminum gasket was replaced with Viton O-rings
The K&N Air Oil Separator is quick and easy to install in about 30 minutes with basic tools and uses factory-style hose connections to quickly snap on and off
Surface area is greatly increased and designed to provide more filtration than any other comparably sized product
E90 ECM Upgrade
Through careful CAD and FEA design efforts
99-2020 K&N Octane Booster, 16oz ST The aluminum gasket was replacedK&N Performance+ Octane Booster boosts power and helps increase performance by reducing detonation, resulting in less knocks, pings and hesitation. This product helps clean internal fuel system parts, while safe on catalytic converters and oxygen sensors.
US$ 304.50
US$ 309.75
US$ 295.00
US$ 367.50