AFE P5R Drop In Air Filter

aFe P5R Drop-In Air Filter Brand: aFe Upgrade your Subaru Impreza WRX STI (2008–2011, H4 2.5L) with the aFe P5R Drop-In Air Filter . Engineered for performance, this direct-fit replacement improves airflow while protecting your engine from harmful contaminants. Direct fit: Designed for seamless installation into the factory airbox—no modifications required. High airflow, superior filtration: Multi-layer oiled cotton media delivers increased intake flow for better throttle response and potential power gains while trapping fine particles. Durable construction: Reinforced synthetic frame and precision sealing ensure a long service life and consistent performance. Washable & reusable: Cost-effective alternative to disposable filters—clean, re-oil, and reinstall. OEM compatibility: Ideal replacement for Subaru Impreza WRX STI 08–11 with H4 2.5L engines. Whether you’re restoring factory performance or seeking a reliable upgrade for daily driving and spirited runs, the aFe P5R Drop-In Air Filter balances protection, airflow, and longevity.