Click to zoom in
K&N 33-2304 washable reusable high-flow air filter uses layered oiled cotton media to improve airflow and trap contaminants for horsepower gains. Direct drop-in replacement installs into factory airbox on select 2005-2021 Subaru Legacy WRX STI Outback Forester Impreza Tribeca models. Backed by K&N No-Hassle Lifetime Limited Warranty for vehicle lifespan durability.
Key Features
- Engineered Power: High-flow media boosts horsepower acceleration overall engine response.
- Easy Installation: Pre-oiled ready to drop into OEM airbox for fast cost-effective power gains no tools required.
- Reusable Saves Money: Washable design saves up to $125 over 200000 miles vs disposable OEM filters MSRP.
- High-flow design proven on dyno for power increases across vehicles.
- Reduces landfill waste vs 200 million annual disposable filters.
- Precision engineered direct OEM fit with lifetime durability.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2006-2007 | Subaru | B9 Tribeca | Limited |
| 2016-2017 | Subaru | Crosstrek | Limited, Premium |
| 2009-2018 | Subaru | Forester | 2.0XT Premium, 2.0XT Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Touring, X, X Limited, additional manufacturer-listed applications |
| 2008-2016 | Subaru | Impreza | 2.5 GT, 2.5i, 2.5i Premium, Limited, Outback Sport, Premium, Sport Limited, Sport Premium, additional manufacturer-listed applications |
| 2005-2019 | Subaru | Legacy | 2.5GT, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Special Edition, 2.5i Sport, 3.0 R, 3.0 R Limited, additional manufacturer-listed applications |
| 2005-2019 | Subaru | Outback | 2.5i, 2.5i Basic, 2.5i L.L. Bean Edition, 2.5i Limited, 2.5i Limited L.L. Bean Edition, 2.5i Premium, 2.5i Special Edition, 2.5i Touring, additional manufacturer-listed applications |
| 2008-2014 | Subaru | Tribeca | Limited, Premium, Touring |
| 2015-2021 | Subaru | WRX | Limited, Premium |
| 2015-2018 | Subaru | WRX STI | Launch Edition, Limited, Series.HyperBlue, Type RA |
| 2013-2015 | Subaru | XV Crosstrek | Hybrid, Hybrid Touring, Limited, Premium |
Specifications
| Brand | K&N Engineering |
|---|---|
| Manufacturer Part Number | 33-2304 |
| Product Type | Air Filters - Drop In |
| Fitment Type | Vehicle Specific |
| Condition | New |
What's Included
One new K&N air filters - drop in identified by manufacturer part number 33-2304. Hardware, adapters, clamps, hoses, filters, and service supplies are included only when stated for this exact product.
About K&N Engineering
K&N develops reusable air filtration, intake, oil filtration, fuel filtration, and related performance products for vehicle-specific and dimensional applications.
Related K&N Engineering Products
- Shop all K&N Engineering products
- K&N 02-07 WRX/STi Drop In Air Filter 11in O/S Length / 6.563in O/S Width / 1.063in Height
- K&N 04-08 Ford F150 / 05-06 Expedition / 05-07 F250 SD / 05-06 Lincoln Navigator Drop In Air Filter
- K&N 04-10 Chrysler 300/300C / 06-09 Dodge Charger / 05-08 Magnum / 08-10 Challenger Drop In Air Filt
Frequently Asked Questions
How do I confirm K&N 33-2304 fits my vehicle?
Match the year, make, and model in the fitment table, then confirm the engine, factory housing, sensor layout, emissions notes, and any application restrictions stated for this exact part.
Is K&N 33-2304 washable and reusable?
Serviceability depends on the exact media used for this part number. Follow the K&N cleaning and oiling directions for this filter and never apply oil to media specified as dry.
What should be checked after installing K&N 33-2304?
Verify seals, clamps, fasteners, hoses, sensors, wiring, and surrounding clearance as applicable. Check for leaks or contact, then follow the manufacturer service and reinspection schedule.
Installation Instructions
- Remove factory filter drop in K&N 33-2304 no airbox modifications needed.
- Compatible with stock hardware 5 minute install average.
Air Filters
Performance Air Filters and Replacement Filters This collection covers filtration for factory air boxes, aftermarket intake systems, custom intake tubing, crankcase ventilation and vehicle HVAC systems. Start with the installation type, then confirm the exact manufacturer part number, filter media, dimensions and application shown on the product page. Similar-looking filters are not automatically interchangeable. Choose the Correct Air Filter Type Direct-fit and drop-in filters: shaped for a specific factory air box or listed intake system. Universal clamp-on filters: selected by flange inside diameter, base and top dimensions, height and available clearance. Cabin and HVAC filters: vehicle-specific filters for air entering the passenger compartment. Breather filters: compact filters for compatible valve-cover, crankcase-vent and catch-can applications. Pre-filters and wraps: outer covers designed for compatible primary filters in dusty, sandy or wet environments. Velocity...
View Air Filters Products
Air Filters - Drop In
Drop in air filters and replacement panel filters for cars, trucks, SUVs, and Jeeps are stocked at Black Ops Auto Works. Shop reusable and dry media panel filters that fit directly into your factory air box from K&N, aFe, AEM, Injen, BMC, and GReddy for vehicles ranging from Corvette and Mustang to Porsche, BMW, and Ford Super Duty diesel trucks. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct filter ships the first time. Black Ops Auto Works carries 1,453 drop in air filter SKUs across dozens of vehicle platforms. What This Category Covers Drop in air filters replace the factory paper filter element inside your existing air box without changing the intake tubing or housing. This collection spans reusable oiled cotton filters, dry synthetic media filters, and OEM style replacement panels sized to fit factory air box dimensions across nearly every make and model. Reusable and Dry Media Options Reusable oiled cotton filters from K&...
View Air Filters - Drop In Products
K&N Engineering
Shop K&N Engineering cold-air intakes, performance air filters, oil filters, cabin filters, universal filters, filter wraps, cleaning kits, and intake accessories at Black Ops Auto Works. The complete K&N collection covers cars, trucks, SUVs, diesel vehicles, motorcycles, ATVs, UTVs, marine engines, industrial equipment, racing applications, and custom intake systems. K&N Cold-Air Intake Systems K&N AirCharger, NextGen, Typhoon, and other performance intake systems replace selected factory airbox, filter, and intake-tube components. Depending on the application, a system may include a molded or metal intake tube, heat shield or enclosed airbox, washable filter, couplers, clamps, brackets, mounting hardware, and provisions for factory sensors or ventilation connections. K&N tests vehicle-specific intake systems and publishes dyno information for individual part numbers. Horsepower, torque, sound, and airflow results are application-specific. Use the test data for ...
View K&N Engineering Products