K&N 33-2304 Air Filter for 2003-2021 Subaru Outback Legacy Forester Impreza WRX

Vehicle Fitment

• 2005-2019 Subaru Outback / BP / BR / BS (All Trims, H4 2.5L / H6 3.6L, AWD)
• 2003-2019 Subaru Legacy / BL / BP / BR / BS (All Trims incl. GT, H4 2.0L / 2.5L / H6 3.0L / 3.6L, AWD & FWD)
• 2008-2019 Subaru Forester / SH / SJ (All Trims incl. Turbo & XT, H4 2.0L / 2.5L, AWD)
• 2007-2016 Subaru Impreza / GE / GH / GP / GJ (All Trims, H4 1.5L / 2.0L / 2.5L, AWD & FWD)
• 2007-2014 Subaru Impreza WRX / GE / GH / GV (All Trims, H4 2.5L Turbo EJ255, AWD)
• 2007-2018 Subaru Impreza WRX STI / GR / GV (All Trims, H4 2.5L Turbo EJ257, AWD)
• 2014-2021 Subaru WRX / VA (All Trims, H4 2.0L FA20DIT Turbo, AWD)
• 2015-2018 Subaru WRX STI / VA (All Trims, H4 2.5L EJ257 Turbo, AWD)
• 2013-2017 Subaru XV / XV Crosstrek / GP (All Trims, H4 2.0L, AWD)
• 2016-2017 Subaru Crosstrek / GP (All Trims, H4 2.0L, AWD)
• 2014-2019 Subaru Levorg / VM (All Trims, H4 1.6T / 2.0T, AWD - Japanese & International Market)
• 2005-2014 Subaru Tribeca / B9 Tribeca (All Trims, H6 3.0L EZ30 / H6 3.6L EZ36, AWD)
• 2008-2017 Subaru Exiga / YA (All Trims, H4 2.0L / 2.5L, AWD - Japanese Market)
• 2003-2019 Subaru Liberty (All Trims, H4 2.0L / 2.5L / H6 3.6L - Australian Market)
• 2009-2014 Subaru Liberty Exiga (All Trims, H4 2.5L - Australian Market)
• 2011-2015 Lancia Thema (All Trims, H4 2.0L / H6 3.6L - European Market)

Fitment Notes

• This filter covers Subaru's second-generation EJ/FB/FA engine airbox architecture - the defining airbox family for models from 2003 through approximately 2019
• Subaru WRX VA fitment confirmed for 2014-2021 with the FA20DIT turbocharged boxer engine; does not fit 2022+ WRX (VB platform) - see K&N 33-5064 for that generation
• Subaru Impreza WRX EJ255 and WRX STI EJ257 fitment confirmed for GE/GH/GV/GR generations (2007-2018)
• Subaru Levorg is a Japanese/international wagon variant; fitment confirmed for VM generation with both 1.6T and 2.0T engines
• Lancia Thema shares Subaru's legacy architecture under the Chrysler/Fiat alliance; fitment confirmed for all European variants
• Does not fit 2020+ Subaru Outback / Legacy (BT platform) - see K&N 33-5064 for those models
• Does not fit first-generation Subaru Impreza GD/GG (1993-2007) - see K&N 33-2154 for that generation

Features

• Drop-in replacement - installs directly into the factory airbox with no modifications
• 4-layer oiled cotton gauze media for high airflow and reliable contaminant capture
• Engineered to increase horsepower and acceleration over stock paper filters
• Pre-oiled and ready to install straight out of the box
• Washable and reusable - cleaning interval every 75,000 miles under normal conditions
• Compatible with OEM airbox and factory MAF sensors - no recalibration required
• Reduces long-term filter replacement costs and environmental waste
• Backed by K&N's No-Hassle Lifetime Limited Warranty

Specifications

• Part Number: 33-2304
• Filter Style: Panel Air Filter
• Filter Media: Oiled Cotton Gauze
• Compatible Engine Sizes: H4 1.5L, H4 1.6T, H4 2.0L (NA & Turbo), H4 2.5L (NA & Turbo EJ255/EJ257/FB25), H4 2.0T (FA20DIT), H6 3.0L (EZ30), H6 3.6L (EZ36)
• Washable: Yes
• Warranty: No-Hassle Lifetime Limited

Included Components

• 1x K&N 33-2304 High-Flow Panel Air Filter

Product Description

The K&N 33-2304 is one of the broadest-coverage Subaru replacement air filters in the K&N lineup - a single drop-in filter serving the Outback, Legacy, Forester, Impreza, WRX, WRX STI, XV/Crosstrek, Levorg, Tribeca, Exiga, Liberty, and Lancia Thema across model years 2003 to 2021. Compatible with naturally aspirated and turbocharged boxer engines from 1.5L through 3.6L H6, this filter drops directly into the factory airbox without modification and is fully compatible with OEM MAF sensors.

Only needing cleaning every 75,000 miles, the K&N 33-2304 is the go-to lifetime upgrade for virtually the entire Subaru EJ/FB/FA-era lineup. Whether daily-driving a Forester, commuting in an Outback, or building a WRX STI for track days, this filter delivers improved airflow and throttle response without voiding the factory warranty.