K&N drop-in factory style replacement panel air filter for the 2008-2021 Subaru WRX and 2008-2018 STi. Designed to install easily into your stock air box and increase power. K&N filters are washable, reusable and engineered to last for the entire lifespan of your vehicle.

Vehicle Fitment:
2008-2021 Subaru WRX
2008-2018 Subaru STi
• Note this does not fit 2019+ STi. Use K&N 33-5092 for 2019+ STi.

Includes:
(1) Air Filter

Replacement for these OEM Part Numbers:
Subaru 16546AA090, 16546AA10, 16546AA10A, 16546AA120, 16546AA12A, 16546AA90, 46051FG000

33-2304 Specs:
• Air Filter Shape: Panel
• Filter Material: Cotton Gauze
• Washable: Yes
• Height: 0.938" (24 mm)
• Outside Length: 8.75" (222 mm)
• Outside Width: 8.563" (217 mm)
• Warranty: 1,000,000 Miles/10 Year
• Weight: 0.9 pound (0.4 kg)

More Info:
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!

• Designed to increase horsepower
• Washable, reusable, and engineered to last for the life of your vehicle
• Designed to provide high airflow and exceptional filtration
• Engineered to fit easily into your factory air box
• 10-Year/Million Mile Limited Warranty
• Only needs cleaning every 50,000 miles under normal highway driving conditions
• Emissions legal in all 50 States
• Will not void vehicle warranty