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

Cleaning frequency depends on your driving conditions. K&N recommends inspecting your filter regularly and cleaning it when you see a buildup of dirt and debris. A good rule of thumb is to clean it every 25,000 to 50,000 miles under normal driving conditions.

Do I need to oil the filter after cleaning?

Yes, K&N air filters require oiling after cleaning to maintain their filtration efficiency. Use K&N filter oil and apply it evenly to the filter media following the instructions on the oil kit. Proper oiling is crucial for trapping dirt and allowing optimal airflow.

Will this filter void my vehicle's warranty?

In most cases, no. Using a K&N replacement air filter will not void your vehicle's warranty under the Magnuson-Moss Warranty Act. This act protects consumers from warranties being voided due to the use of aftermarket parts, unless the part is proven to be the direct cause of a failure.

K&N 33-2004 Air Filter for Porsche 911

Name: K&N 77-83 Porsche 911 CSI F/I Drop In Air Filter
Brand: K&N
Price: 157.99 USD
Availability: InStock

K&N 77-83 Porsche 911 CSI F/I Drop In Air Filter

$157.99

Only 3 left in stock

Drop-in replacement air filter. Washable and reusable, it's built to increase airflow and horsepower.

Key Features

Washable and reusable — saves money compared to disposable filters
Designed to increase horsepower — improved airflow for better performance
Drop-in replacement — installs easily in the factory air box
Oiled cotton media — captures contaminants effectively
Backed by K&N's 10-Year/Million Mile Limited Warranty

⚠️ 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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Fits this vehicle

Porsche 911 1974-1983

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!