K&N 57i Series Performance Cold Air Intake - High-flow for BMW E90/91/93 335I N54 Engine 57S-2003

The K&N Performance Airbox is designed to significantly reduce air flow restriction and improve airflow efficiency. By replacing the restrictive factory air filter and air box, it allows your engine to inhale more air than the stock assembly, resulting in increased power and acceleration throughout the engine's RPM range. The fully enclosed injection-molded airbox connects to the factory air intake hose, and the removable lid ensures easy access for filter cleaning. This performance airbox is relatively simple to install using commonly available tools and fits within the existing airbox space. Built to last for the life of your vehicle, these airbox systems are backed by K&N's No-Hassle Lifetime Limited Warranty. Some K&N 57S Series Performance Airboxes comply with the latest TUV emissions and sound regulations.

User 1
Installation Instructions
Installation Instructions

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