How often should I clean my K&N air filter?

Cleaning depends on your driving conditions. K&N recommends inspecting your filter every 12 months or 12,000 miles and cleaning when you see a buildup of dirt and debris. Off-road driving will require more frequent cleaning.

Do I need to oil the filter after cleaning?

Yes, K&N filters use a special oil to help trap dirt particles. After cleaning, you must re-oil the filter with K&N filter oil to maintain its filtration properties. Refer to the manufacturer's instructions for proper oiling procedures.

What is the warranty on this K&N air filter?

K&N Engineering backs this filter with a 10-Year/Million Mile Limited Warranty. This means the filter is warranted to be free from defects in materials and workmanship for ten years or one million miles of use.

K&N 04 BMW 545i 4.4L V8 Drop In Air Filter

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K&N Engineering

K&N 04 BMW 545i 4.4L V8 Drop In Air Filter

Name: K&N 04 BMW 545i 4.4L V8 Drop In Air Filter
Brand: K&N Engineering
Price: 68.99 USD
Availability: InStock

$68.99

Washable, reusable air filter improves airflow. Direct fit for your factory air box.

Key Features

Washable — can be cleaned and reused
Direct drop-in replacement — installs in the factory air box
Oiled cotton gauze — improved airflow vs. paper filters

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

Will this fit your vehicle?

Compatible with 14 vehicles

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Since 1957

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Product Details

K&N's replacement High-Flow Air Filters are designed to increase horsepower while providing exceptional engine protection, and are covered by K&N's No-Hassle Lifetime Limited Warranty.
BMW 545i V8-4.4L F/I; 2003-2005

K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10-Year/Million Mile Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's No-Hassle Lifetime Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!