How do I install the K&N drop-in air filter?Installation is straightforward; simply remove your old air filter and replace it with the new K&N drop-in air filter following your vehicle’s specific instructions.How often should I clean my K&N air filter?Clean your washable, reusable K&N drop-in air filter when it appears dirty, typically every 30,000 to 50,000 miles, to maintain optimal engine performance.K&N Drop-in Air Filters are engineered for enhanced engine performance in your BMW X3 or Z4, boasting a top score of 9 for Engine Performance. Utilizing state-of-the-art, layered, oiled cotton media, these filters significantly improve airflow and contaminant capture. Experience sustained peak performance and superior engine protection with this washable, reusable upgrade.Key Featureswashable, reusable High-Flow Air Filtersstate-of-the-art design of layered, oiled cotton mediaengineered to improve airflow and capture contaminantsdesigned to provide an increase in horsepowerreusable, engineered to last for the entire lifespan of your vehiclebacked by K&N’s 10-Year/Million Mile Limited WarrantyWhy Choose the KN Drop in Air FiltersDelivers sustained peak performance with a filter that cleans and reuses.Achieves superior engine protection through advanced filtration technology.Provides a noticeable boost in acceleration and throttle response.Transforms your driving experience with enhanced engine breathing.Who Is This For?Street Performance 8/10Engineered to improve airflow and increase horsepower.Track / Autocross 7/10Designed for improved airflow and potential horsepower increase.Engine Performance 9/10High-flow, oiled cotton media improves airflow and captures contaminants.Easy DIY Install 10/10Drop-in install type for simple replacement.Racing Competition 7/10Potential for horsepower increase and improved airflow.Daily Driving Comfort 6/10Improved airflow may contribute to smoother engine operation.Frequently Asked QuestionsWhat is a K&N drop-in air filter?A K&N drop-in air filter is a high-flow, washable, and reusable air filter designed to replace your vehicle’s stock air filter. It utilizes state-of-the-art design of layered, oiled cotton media to improve airflow and capture contaminants, offering a sustained peak performance.How easy is it to install a K&N drop-in air filter?Installation of a K&N drop-in air filter is straightforward with its ‘drop-in’ install type. This makes it an easy DIY upgrade, designed for simple replacement of your existing air filter without special tools or modifications.Will a K&N drop-in air filter increase my vehicle’s horsepower?Yes, K&N drop-in air filters are engineered to provide an increase in horsepower and deliver a noticeable boost in acceleration. This aligns with its ‘Street Performance’ use case scoring an 8, enhancing engine breathing for a more responsive driving experience.How do I maintain my K&N drop-in air filter?Maintaining your K&N drop-in air filter is simple and involves cleaning and reusing it periodically. Its washable, reusable high-flow cotton media is engineered to last for the entire lifespan of your vehicle, providing sustained peak performance through easy maintenance.Additional ResourcesOfficial K&N Engineering Product PageInstallation Guide (PDF)Important Notices Proposition 65 Warning: This product can expose you to chemicals including lead and/or other substances known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.{“@graph”:[{“mpn”:”33-2372″,”sku”:”KNN33-2372″,”gtin”:”024844195678″,”name”:”KN Drop in Air Filters”,”@type”:”Product”,”brand”:{“url”:”https://www.knfilters.com”,”name”:”K&N Engineering”,”@type”:”Brand”,”sameAs”:”https://en.wikipedia.org/wiki/K&N_Engineering”},”image”:”https://d32vzsop7y1h3k.cloudfront.net/cdb22abdc1653f766e23360ade54270d.JPG”,”offers”:{“@type”:”Offer”,”price”:”68.99″,”seller”:{“url”:”https://www.motorsportmayhem.com”,”name”:”Motorsport Mayhem”,”@type”:”Organization”},”availability”:”https://schema.org/InStock”,”itemCondition”:”https://schema.org/NewCondition”,”priceCurrency”:”USD”,”priceValidUntil”:”2027-05-27″},”category”:”Air Filters – Drop In”,”description”:”Delivers sustained peak performance with a filter that cleans and reuses. Achieves superior engine protection through advanced filtration technology. Designed to provide an increase in horsepower”,”isRelatedTo”:{“name”:”Air Filters – Drop In”,”@type”:”Thing”},”alternateName”:”K&N Drop in Air Filter Horsepower Gain”,”additionalProperty”:[{“name”:”Feature”,”@type”:”PropertyValue”,”value”:”washable, reusable High-Flow Air Filters”},{“name”:”Feature”,”@type”:”PropertyValue”,”value”:”state-of-the-art design of layered, oiled cotton media”},{“name”:”Feature”,”@type”:”PropertyValue”,”value”:”engineered to improve airflow and capture contaminants”},{“name”:”Feature”,”@type”:”PropertyValue”,”value”:”designed to provide an increase in horsepower”},{“name”