Torque Solution Cylinder 4 Coolant Mod for EJ WRX/STi (TS-SU-585) DPTOOL 84201FE490 LH (USDM Driver Side)

84201FE490 LH (USDM Driver Side) 84201FE480 RH (USDM Passenger Side)

Weighs 11

(2) SAE Quick Disconnect Male Fittings

It had to make that power reliably

Torque Solution Cylinder 4 Coolant Mod for EJ WRX/STi (TS-SU-585) DPTOOL 84201FE490 LH (USDM Driver Side)The 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