K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3978XD

K&N performance High-Flow Air Filters are engineered to improve engine performance by increasing airflow up to 50%. Unlike disposable paper filters which must be frequently replaced, K&N Air Filters are washable, reusable, and engineered to last for the life of your vehicle or outdoor power small engine. Engineered to fit easily into your factory air box, installation can be completed in a matter of minutes! K&N develops and tests each product on the world’s toughest race tracks, so we can bring the highest level of performance to your daily driving. Join the millions of customers who have saved money and improved vehicle performance by upgrading to K&N filtration.

• Engineered power: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters, increasing power and acceleration. Clogged or dirty air filters can reduce your vehicle's acceleration by up to 10%
• Easy installation: Pre-oiled and ready to drop into your factory air box. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains
• Cost-effective: K&N high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters
• Durable design: A K&N filter will last longer than 10 disposable filters
• Superior protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants
• Low-maintenance: 50,000 miles before your first cleaning under normal highway driving conditions
• High-quality: Made in America
• Race-tested: The Official Air Filter of NASCAR. Trusted on the racetrack-made for your vehicle