Torque Solution Cylinder 4 Coolant Mod Subaru 2002-2014 WRX / 2004-2021 STI

The Torque Solution Cylinder 4 Coolant Mod has been designed to increase the coolant flow to the cylinder number 4 head area. This will help reduce the cylinder number 4 coolant temps and keeps the temperatures more uniform with the rest of the cylinders.