K&N Filters 33-2231 Air filter for BMW 3 Series, X3 Length: 238 mm, Square, Long-life Filter

Unlike disposable filters which must be frequently replaced, 33-2231 K&N® High-Flow Air Filters™ are washable, reusable, and engineered to last for the life of your vehicle. Feel confident in your purchase with a "No-Hassle" Lifetime Limited Warranty.

Originally designed for high-performance on the racetrack, now custom-designed for your vehicle make and model. 33-2231 K&N® air filters are tested on a SuperFlow flow bench to ensure increased airflow over a stock filter. View testing data for many K&N filters on individual product pages.

K&N’s state-of-the-art filter features thousands of microscopic cotton fibers, and an innovative design of layered, oiled cotton media helps to capture dirt and shield your engine from contaminants. Each 33-2231 filter design is tested in an ISO 5011 laboratory to ensure excellent filtration efficiency for outstanding engine protection.

Over 100 million disposable air filters and their packaging waste end up in landfills each year. Choosing a washable, reusable product that lasts for the lifespan of your vehicle helps to reduce unnecessary waste.