afe Magnum FLOW Universal Air Filter 6F x 7-1/2B x 5-1/2T (Inverted) x 14IN H DD0365 The Billet Cap Cover affixes

The Billet Cap Cover affixes to the top of your factory cap

keep in mind that the NHRA mandates the presence of a protective barrier against leaks or debris on the track

Constructed with 100% Polyurethane from the top and base

The Revolution RS for the GDB Subaru WRX/STI  features a full non-tapered 76mm (3”) diameter piping

afe Magnum FLOW Universal Air Filter 6F x 7-1/2B x 5-1/2T (Inverted) x 14IN H DD0365 The Billet Cap Cover affixesWith five layers of progressively finer mesh cotton gauze media between 100% polyurethane top and base, this high flow "oiled" inverted conical performance filter provides excellent airflow for maximum horsepower and torque. Washable and reusable for multiple cleanings, the tall, open, evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Pliable polyurethane flange with integrated bumps insures