Perrin Performance [08-14 Subaru Impreza, 15-21 WRX, STI] Replacement Foam Filter

Perrin Replacement Foam Filter for 2008‑2021 WRX/STI is a direct replacement air filter element designed for the PERRIN cold air intake systems used on Subaru WRX and STI models from 2008 through 2021. It’s built to maintain strong airflow while trapping dust and debris better than a standard paper filter, keeping the engine breathing clean air without complex install steps.

• Designed specifically for 2008–2021 Subaru WRX and STI applications with PERRIN intake systems
• Open-cell foam construction with specially oiled media for dirt capture and minimal airflow loss
• Two-piece design allows removal of the foam element for cleaning and reuse
• Washable and reusable filter media extends service life compared with disposable paper filters
• Simple installation that doesn’t require tools or tuning adjustments
• Fits intake systems accepting a ~2.75-inch inner diameter filter
• Includes one replacement foam filter element

This replacement element preserves airflow while enhancing particulate capture compared with basic stock filters, letting the engine continue to pull clean air efficiently as part of regular maintenance of your intake system.