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

The cleaning interval depends on your driving conditions. K&N recommends cleaning the filter when you notice a buildup of dirt or debris, or every 50,000 miles under normal highway driving. Off-road driving may require more frequent cleaning.

Do I need to oil the filter after cleaning?

Yes, the filter needs to be re-oiled after cleaning to maintain its filtration efficiency. Use K&N filter oil and follow the instructions carefully to avoid over-oiling, which can damage your mass airflow sensor.

What is the warranty on this air filter?

K&N warrants their air filters to be free from defects in material and workmanship for 10 years or 1,000,000 miles. This warranty applies when the filter is properly installed and maintained.

K&N E-3321 Air Filter

Name: K&N Custom Filter Oval Length 6.125in I/S /7in O/S x Width 3.625in I/S/ 4.5in O/S x Height 1.75in
Brand: K&N
SKU: k-n-engineering-k-n-custom-filter-oval-length-6-125in-i-s-7in-o-s-x-width-3-625i-t14-252753
Price: 49.72 USD
Availability: BackOrder

K&N Custom Filter Oval Length 6.125in I/S /7in O/S x Width 3.625in I/S/ 4.5in O/S x Height 1.75in

$49.72

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Washable and reusable air filter. Designed to increase airflow and horsepower.

Key Features

Washable and reusable — saves money compared to disposable filters
Oiled cotton media — traps contaminants effectively
Drop-in replacement — installs easily in the factory air box
Designed to increase horsepower — improved airflow for better performance

⚠️ 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

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Product Details

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!