Torque Solution TS-SU-585 Cylinder 4 Coolant Mod for Subaru EJ Engines

Vehicle Fitment

• Subaru EJ20 & EJ25-powered vehicles including:
• 2002-2014 Subaru WRX (turbocharged EJ engines)
• 2004-2020 Subaru WRX STI (turbocharged EJ engines)
• 2004-2008 Subaru Forester XT (turbocharged EJ engines)
• 2005-2009 Subaru Legacy GT/Outback XT (turbocharged EJ engines)

Features

• Engine coolant mod designed to improve flow to cylinder #4 head area
• CNC-machined 6061-T6 aluminum fittings for strength and precision
• Black anodized finish for corrosion resistance and durability
• Multi-layer silicone hose for flexible, high-temp coolant routing
• Includes stainless steel hose clamps
• Helps reduce localized overheating and knock in cylinder 4
• Addresses common EJ ringland failure cause
• Limited lifetime manufacturer warranty

Specifications

• Part Number: TS-SU-585
• Material: 6061-T6 billet aluminum & silicone hose
• Finish: Black anodized
• Hose: Multi-layer silicone
• Clamps: Stainless steel
• Application: Subaru EJ20/EJ25 coolant system
• Warranty: Limited lifetime from Torque Solution

Included Components

• 1x Billet aluminum coolant fitting
• 1x Billet aluminum T-fitting
• 1x Multi-layer silicone coolant hose
• 4x Stainless steel hose clamps

Product Description

The Cylinder 4 Coolant Mod is designed for Subaru engines equipped with EJ20 and EJ25 cylinders. This coolant system upgrade increases coolant flow specifically to the cylinder #4 head area - a hotspot on EJ engines known for higher temperatures and prone to knock and potential ringland failures. By improving coolant distribution, this mod helps make temperatures more uniform across all cylinders, enhancing engine reliability under load.

Constructed with CNC-machined 6061 billet aluminum fittings and a reinforced silicone hose, the kit includes stainless steel clamps for secure installation. The black anodized finish resists corrosion and heat, making this a durable and practical preventative upgrade for EJ-powered WRX, WRX STI, Forester XT, and Legacy GT/Outback XT applications. Installation involves integrating the included fittings and hose into your existing coolant pathway, and professional installation is recommended.