aFe Magnum FLOW Air Filter for 2012-2020 Subaru WRX (30-10161/31-10161) Select Air Filter::DRY S Grey (31-10161) They are guaranteed not to

They are guaranteed not to fail to the said RPM

Faster response time improves wideband feedback control

• Fully Reversible Back to OEM Spec with No Modifications Needed

Height: Width: Thickness: Part Number: 4" 10" 1

FP Part Numbers 2027060

aFe Magnum FLOW Air Filter for 2012-2020 Subaru WRX (30-10161/31-10161) Select Air Filter::DRY S Grey (31-10161) They are guaranteed not toThe Pro 5R air filter and Pro DRY S air filter are both high performance OE replacement filters designed to outflow stock paper filters, improving horsepower and torque. The Pro 5R features five layers of progressively finer cotton gauze for maximum airflow, while the Pro DRY S uses three layers of synthetic media for easy maintenance and convenience. Both filters are washable, reusable, and constructed with 100% polyurethane for durability.