Perrin X-PSP-INT-324-2 2.75in Replacement Foam Air Filter for Subaru WRX/STI AWD

Vehicle Fitment

• 2008-2021 Subaru WRX (GR/GV/VA, 2.5L H4 Turbo, AWD) - with PERRIN intake system
• 2008-2021 Subaru STI (GR/GV/VA, 2.5L H4 Turbo, AWD) - with PERRIN intake system

Fitment Notes

• Direct replacement for PERRIN Performance WRX/STI cold air intake systems: PSP-INT-322, PSP-INT-323, PSP-INT-325, and PSP-INT-326
• Also fits any intake system with a 2.75" inner diameter filter mouth
• Filter inlet inner diameter (I.D.) is 2.75" - verify your intake's inlet size before ordering
• This is the oiled foam version; the dry media version is X-PSP-INT-324

Features

• Open-cell reticulated polyurethane foam construction for minimal airflow restriction
• Pre-oiled with specially formulated filter oil - ready to install straight out of the box
• Two-piece design allows the foam sleeve to be removed separately for easy cleaning
• Washable and reusable - rinse under a faucet, wring out, re-oil, and reinstall
• Foam grabs and retains dirt rather than blocking it, maintaining airflow as the filter loads
• Superior dust holding capacity compared to standard paper filter elements
• Backed by PERRIN Performance's 5-year warranty
• Estimated install time: 30 minutes

Specifications

• Mouth Inner Diameter (I.D.): 2.75"
• Overall Width: 6"
• Overall Height: 11"
• Filter Type: Open Cell Foam, Oiled
• Design: Two-Piece (removable foam element)
• Condition: Pre-Oiled
• Warranty: 5 Years

Included Components

• 1x PERRIN Replacement Foam Air Filter (pre-oiled)

Product Description

The PERRIN X-PSP-INT-324-2 is a replacement open-cell foam air filter designed for PERRIN Performance cold air intake systems on the 2008-2021 Subaru WRX and STI. Compatible with PERRIN intake part numbers PSP-INT-322, 323, 325, and 326, this filter maintains the strong airflow characteristics of the original while renewing filtration capability. The oiled foam construction captures dust and debris throughout its open-cell matrix rather than at the surface, sustaining airflow levels as the filter accumulates dirt over time.

The two-piece design makes cleaning simple - remove the foam sleeve from the filter frame, rinse it under water, wring it out, and re-oil before reinstalling. Because it is washable and reusable, the filter can last the life of the vehicle with regular maintenance. With a 2.75" inner diameter and 11" overall height, it also fits any third-party intake system with a compatible 2.75" filter mouth. Always verify your intake's inlet sizing before ordering to confirm proper fitment.