Manley 99.75mm Bore +.25mm Oversized Ring Set Subaru WRX / STI EJ257 2004-2021 Stockdrain This system was designed to

This system was designed to reduce movement of the rear subframe

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

They just make things feel better

Fits 02-07 WRX as well as 04+ STI

and Forester XT will improve your airflow

Manley 99.75mm Bore +.25mm Oversized Ring Set Subaru WRX / STI EJ257 2004-2021 Stockdrain This system was designed toPart #: 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