Manley 99.75mm Bore +.25mm Oversized Ring Set Subaru WRX / STI EJ257 2004-2021 Stockdrain The COBB Tuning 3-Port BCS

The COBB Tuning 3-Port BCS features 1/8" low-profile barb fittings to keep the unit compact

Because ARP studs are manufactured to such exacting tolerances

Each component features a uniform 3K 2x2 twill weave and an optimized carbon-to-resin ratio

and Forester XT will improve your airflow

Manley 99.75mm Bore +.25mm Oversized Ring Set Subaru WRX / STI EJ257 2004-2021 Stockdrain The COBB Tuning 3-Port BCSPart #: 46997 4 Manley Subaru EJ257 pistons now include Napier style second rings and higher tension oil rings (by Total Seal) for superior oil control. Manley 04+ Subaru WRX STi (EJ257) 99. 75mm Bore 1. 2mm x 1. 2mm x 2. 0mm +. 25mm Oversized Ring Set