Torque Solution Cylinder 4 Coolant Mod for EJ WRX/STi (TS-SU-585) Porsche Failing to do so can

Failing to do so can cause issues or damage to your engine

Not recommended for forced induction applications

it also replaces both hard lines as well

most accurate speedometer available

Torque Solution Cylinder 4 Coolant Mod for EJ WRX/STi (TS-SU-585) Porsche Failing to do so canThe Torque Solution cylinder 4 coolant mod for 02 14 WRX and 2004 2021 STi was designed to increase coolant flow to the cylinder #4 head area. This additional coolant flow helps reduce cylinder #4 coolant temps and keeps the temps more uniform compared to the rest of the cylinders. This will help reduce knock and detonation in cylinder #4, which is known to cause the dreaded EJ ringland failure. Keep your EJ happy by installing this kit! Includes CNC