How often should I clean and re-oil my K&N air filter?

K&N recommends cleaning and re-oiling your filter every 50,000 miles for normal highway use. If you drive in dusty conditions, you may need to clean it more often. Use a K&N filter cleaning kit to maintain the filter's performance and warranty.

Does this filter come pre-oiled?

Yes, this K&N air filter comes pre-oiled and ready to install. You do not need to oil it before the initial installation. Just drop it in your factory airbox, and you're good to go.

Will this filter void my vehicle's warranty?

Using a K&N replacement air filter will not void your vehicle's warranty. K&N air filters are designed to meet or exceed OEM specifications, and the Magnuson-Moss Warranty Act protects your right to use aftermarket parts without voiding your warranty.

K&N 33-2304 Air Filter for Subaru WRX/STi

Name: K&N 05-08 LGT / 08-11 WRX / STi Drop In Air Filter
Brand: K&N
Price: 68.99 USD
Availability: InStock

K&N 05-08 LGT / 08-11 WRX / STi Drop In Air Filter

$68.99

In Stock

Drop-in replacement air filter. Washable and reusable.

Key Features

Washable — clean and re-oil for extended use
Reusable — lasts longer than paper filters
Drop-in replacement — installs in the factory air box
Oiled cotton gauze — improved airflow and filtration

⚠️ 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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Will this fit your vehicle?

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!