2009 BMW X5 K&N Air Filter | X5 Performance Air Filters

Questions and Answers about K&N Air Filters

Q: Does the K&N air filter fit into my air cleaner housing just like a factory air filter?

A: Yes a K&N air filter is designed to the exact dimensions of a factory air filter.

Q: Do you really get a performance increase from a K&N air filter?

A: Yes. K&N has Dyno proven results that back up all increased horsepower claims they make. On average you will gain 2-5 horsepower just by changing your air filter to a K&N.

Q: I have also read that a K&N air filter will increase fuel mileage in my vehicle. Is this true?

A: Yes. With less air intake restriction your vehicle will not have to work as hard to get air into the engine. This is why you get better MPG from a K&N air filter.

Q: Does K&N really stand behind the million mile guarantee on filters?

A: Yes. K&N will replace your air filter anytime it fails within 1 million miles. Chances are you will never have the same car for 1 million miles but if you do K&N will stand behind it.

Q: Do I need to clean a K&N air filter?

A: Yes K&N offers a cleaning kit that should be used every 15000-30000 miles of use. This will keep your filter performing like new.