Compatible: (2.5L)

2018 – 2021 Subaru WRX STI

NOT LEGAL FOR USE IN CALIFORNIA

Gain a guaranteed increase in horsepower and torque with a K&N cold air intake system featuring a mandrel-bent aluminum intake tube. Each system is paired with a washable, reusable High-Flow Air Filter featuring oiled cotton filter media. The oversized, conical filter design allows you to go up to 100,000 miles between filter services under normal highway driving conditions. A custom heat shield or air box helps protect intake air from the high temperature of your engine bay, and the entire system can typically be installed in less than 90 minutes. Some intakes are not legal for sale or use on any pollution controlled motor vehicle in California. See the product specifications for CARB status on each part for a specific vehicle.

• Guaranteed to increase horsepower and torque
• Mandrel-bent aluminum intake tube paired with oversized oiled cotton air filter
• Engineered to provide high airflow and exceptional filtration
• Replaces factory air filter and intake tube
• Filter only requires cleaning every 100,000 miles under normal highway driving conditions
• Typical installation can be completed in 90 minutes or less with simple hand tools
• 10-Year/Million Mile Limited Warranty
• Will not void vehicle warranty

Filtration & Engine Protection

K&N automotive filters offer an optimal blend of high air flow, filtration efficiency, durability and dust capacity. K&N high flow filter media has been tested in our own in-house laboratories and by independent labs using the ISO5011 air filtration standard developed by the Society of Automotive Engineers. Our goal at K&N is to design reusable filters with the most possible airflow while providing guaranteed engine protection.

Fuel Economy

Fuel economy testing and mileage claims are not as cut and dry as they may seem. The EPA’s website states, “EPA’s fuel economy estimates are designed to allow consumers to comparison shop. Your fuel economy will almost certainly vary from the EPA’s fuel economy rating. This is based on a number of factors, such as weather, road conditions, your driving and maintenance habits, and your use of air conditioning.” Many exaggerated claims are found in the marketplace by automotive product manufacturers claiming to improve vehicle gas mileage. K&N does not make any general fuel economy claims. We simply encourage you to try our washable filter products for yourself.

K&N Air Filter Oil

A K&N reusable filter is designed with four to six layers of cotton gauze media sandwiched between two aluminum wire screens. The cotton media is then treated with a specially formulated grade of filter oil that causes tackiness throughout the cotton’s microscopic strands. The cotton in a K&N replacement air filter allows high volumes of airflow, and when combined with the tackiness of the filter oil creates an efficient filtering media that ensures engine protection.

K&N Consumer Protection

The K&N Consumer Protection Plan goes a step further than the K&N Million Mile Limited Warranty. At times, the performance aftermarket has been plagued by automotive manufacturers and auto dealers that may attempt to discourage you from modifying your vehicle. They would prefer that you buy OE parts and not customize your car or truck and have even voided their own manufacturer’s warranty due to vehicle modifications. K&N and the Magnuson-Moss Warranty Act protect consumers from such denied warranty claims. When you buy a K&N OE replacement filter orair intake systemyou can be confident your vehicle’s warranty will remain in effect. If you encounter a dealership that wants to void your warranty because of one of our products, K&N will resolve the issue so you won’t have to. We believe K&N makesThe World’s Best Air Filterand we stand behind that claim 100 percent.

Consumer Protection Pledge

K&N pledges to our customers that they will not be taken advantage of and charged for a repair due to a dealership warranty denial blamed on the presence of a K&N product.

Install Guide:

Warranty: