Brian Crower Spring + Steel Retainers - Subaru WRX / STI EJ205/EJ255/EJ257 2002-2021 ET45 *Fitment may require modification to

*Fitment may require modification to engine bay components

* A MBC allows you to run higher than stock boost levels by preventing the wastegate from opening at its rated pressure

it is important to keep in mind that increasing horsepower will result in heat soak of the stock intercooler and parasitic power loss

HIGH-FLOW CATALYTIC CONVERTER (CAT):

Brian Crower Spring + Steel Retainers - Subaru WRX / STI EJ205/EJ255/EJ257 2002-2021 ET45 *Fitment may require modification toDesigned for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. BC titanium retainers are CNC machined from 6AL4V round bar titanium to exacting tolerances. Spring Pressure: Seat: 1. 420(in) @ 60 lbs, Open: 1. 000(in) @ 160 lbs, Coil Bind: 0. 860(in) No machine work required. May fit other EJ equipped Subaru