Perrin 08-21 WRX / 08-18 STi Drop In Filter - PSP-INT-110

 This is a direct drop-in filter designed to work with your factory intake box, and it has been designed with better breathing capabilities for improved performance.

DETAILS:

• Increases airflow
• Improves power and torque
• Improves throttle response
• Made of reticulated polyurethane foam
• Foam filter cross-section
• Full 3/4" of filter media