K&N 57S-2003 K&N BMW E90/91/93 335I N54 Engine Performance Air Intake SystemK&N 57S 2003 K&N BMW E90 91 93 335I N54 Engine Performance Air Intake System The K&N Performance Airbox is designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. Replacing the restrictive factory air filter and air box allows your engine to inhale more air than with the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. A fully enclosed injection
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K&N 57S-2003 K&N BMW E90/91/93 335I N54 Engine Performance Air Intake System