The K&N 57i Series Performance Intake Kit is a high-performance air intake system designed specifically for select BMW models, including the 04-10 118i/120i, 07-08 320si, and 05-10 318i/320i with a 2.0L L4 engine. Constructed with high-quality materials such as steel, aluminum, silicon, or reinforced nylon, this kit replaces the factory air box to eliminate size restrictions and improve airflow. Its open-air filter design offers increased surface area, resulting in lower restriction and enhanced airflow throughout the RPM range. The larger filter also captures and retains more dirt, extending service intervals up to 100,000 miles before cleaning is required. This economical upgrade delivers improved power and performance while maintaining durability and long-term reliability.
Designed for 2004–2010 BMW 1 Series and 2007–2008 3 Series equipped with the specified engines, this intake kit is a direct bolt-on replacement that enhances engine breathing and performance. It can be adapted to various vehicle configurations based on available space under the hood. The kit includes all necessary adapters and components for installation, making it suitable for street and daily driving applications. Note that these intake systems are not legal for use in California or other states with California emission standards. This product is ideal for enthusiasts seeking increased power, improved throttle response, and a more aggressive engine sound.
