Optimized Title: K&N Cold Air Intake Kit for 1999-2005 BMW 3 Series

K&N's air intake systems are engineered to deliver increased performance, outstanding durability, and sleek aesthetics, available in a variety of finishes and powder coatings. The state-of-the-art High-Flow Air Filter helps shield the engine from contaminants, while the meticulously designed aerodynamic tube contributes to a guaranteed increase in horsepower and torque. Designed to improve acceleration, towing, and throttle response, K&N intakes provide world-class engine protection and are dyno-tested to deliver more airflow compared to OEM systems.

Easy to install and maintain, K&N intakes require air filter cleaning only every 100,000 miles under normal highway driving conditions. The RU-4730 replacement air filter is compatible with 2001-2005 BMW 325Ci, 325i, and 325Xi, as well as 1999-2000 BMW 323Ci, 323i, 2000 BMW 328Ci, and 1999-2000 BMW 328i.

K&N's cold air intake systems provide a less restrictive path for airflow, increasing the volume of cool, oxygen-rich air into the engine, resulting in an estimated increase of up to 10HP and 8 ft.lbs. of Torque. The intake systems allow the engine to breathe and sound as it should, with a growl on acceleration and a quiet operation at speed.

K&N's air intake horsepower and torque testing is performed on wheel-based dynamometers, and the reports are included with each intake system, providing customers with trusted performance data. The signature, reusable air filter combines four layers of pleated, breathable cotton with K&N's red filter oil to absorb dirt and dust particles, allowing clean air to continue flowing into the engine.

The durable, roto-molded intake tube and custom heat shield help increase the volume of airflow to the engine while protecting the intake air from the high temperatures of the engine bay. K&N's air intakes are backed by a No-Hassle Lifetime Limited Warranty and will not void the manufacturer's vehicle warranty, providing premium engine protection from a trusted brand.

The entire air intake system can typically be installed in less than 60 minutes with basic hand tools, thanks to the detailed, step-by-step instructions and all necessary parts included. Proudly made in the USA, K&N air intakes are engineered for trusted quality and reliability, and are backed by US-based customer support.

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