Review on K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter for 2000-2015 Toyota/Lexus V8 Truck and SUV (4Runner, Sequoia, Prado, Tundra, GX470) - Model 33-2144 by Joseph Hamilton

This made a big difference in my start and throttle position. A fuel economy test was conducted to determine an increase in fuel economy that was not noticeable but showed an increase of (1) mpg. It just "breathes" better and the engine runs "smoother" and the engine seems to be subjected to less stress under acceleration than the paper filter we used previously. Inspection. A refill kit (cleaning and maintenance) is available at a reasonable price and easy to use, but don't expect the average user/buyer to have to service this filter as it requires basic mechanical skills and Personal Protective Equipment (PPE). Has a lifetime or 1,000,000 mile warranty under normal use. K&N offers "standard" filter removal kits for higher airflow and performance, and they are much more expensive than this "direct replacement" filter, leading to the rating of this product as suitable for standard/normal flow conditions (CFM) or the listed performance increase confirmed on the K&N Engineering website. All I know is this filter works would buy again and would recommend this product as good value for money.