aFe MagnumFLOW Air Filters IAF P5R A/F P5R 5-1/2F x (7x10)B x 5-1/2T x 8H Ball Joint Injector Dynamics 1340cc Injectors -

Injector Dynamics 1340cc Injectors - 60mm Length - 14mm Purple Top - 14mm Lower O-Ring (Set of 2)

and will make the whistling sound more readily than the 5701 (high boost and RPM is required to get the whistle from a 5701)

Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 100mm +

The included radiator hose fits the K20A/A2/A3/Z1 water neck

aFe MagnumFLOW Air Filters IAF P5R A/F P5R 5-1/2F x (7x10)B x 5-1/2T x 8H Ball Joint Injector Dynamics 1340cc Injectors -With five layers of progressively finer mesh cotton gauze media between 100 polyurethane top and base, this high flow "oiled" 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 tight, no leak