Brian Crower Valve Spring & Titanium Set - Subaru EJ20/25 WRX/STI Intake Flex section - your motor

Flex section - your motor and mufflers are both mounted using rubber or poly mounts and can move independent of one another - if there isn't a flex section or donut gasket allowing relative movement

The case halves are sealed with new OEM main case bolts and sealant

causing a potentially unsafe boost curve

(Some models are NOT compatible with EDFC series

Brian Crower Valve Spring & Titanium Set - Subaru EJ20/25 WRX/STI Intake Flex section - your motorBrian Crower valve springs by PAC Racing are designed for high rpm use and are wound from only the highest grade, super clean, chrome silicone alloy. BC springs feature proprietary processing procedures for consistent pressures. BC titanium retainers are CNC machined from 6AL4V round bar titanium to exacting tolerances. Specifications Spring# BC1600 Spring Pressure: BC1600 Seat: 1. 420" @ 80 lbs Open: 1. 000" @ 178 lbs Coil Bind: 0. 850" (no machine