Torque Solution TS-SU-755HF High Flow Thermostat Housing Subaru EJ WRX STI 02-21

Vehicle Fitment

• 2002-2014 Subaru WRX (EJ20/EJ205/EJ255)
• 2004-2021 Subaru STI (EJ207/EJ257)
• 2004-2013 Subaru Forester XT
• 2005-2009 Subaru Outback XT
• 2005-2009 Subaru Legacy GT

Fitment Notes

• Direct OEM replacement fitment - uses factory mounting points and hardware pattern
• Compatible with OEM thermostat and most aftermarket thermostats designed for Subaru EJ engines
• Stainless steel install hardware included - no additional hardware required

Features

• High-flow design - smooth large tapered bore promotes improved coolant circulation compared to the restrictive OEM thermostat housing, supporting better cooling efficiency especially in performance builds
• CNC machined 6061-T6 billet aluminum construction - significantly more durable than the OEM plastic/cast housing; resistant to cracking, warping, and coolant degradation
• Black anodized finish with Torque Solution laser-engraved logo - corrosion resistant and provides a premium, purposeful appearance in the engine bay
• Backed by Torque Solution's Limited Lifetime Warranty

Specifications

• Part Number: TS-SU-755HF
• Component Type: High Flow Billet Thermostat Housing
• Material: CNC Machined 6061-T6 Billet Aluminum
• Finish: Black Anodized with Torque Solution Laser Engraving
• Hardware: Stainless Steel
• Warranty: Limited Lifetime Warranty

Included Components

• 1x High Flow Billet Aluminum Thermostat Housing (black anodized)
• Stainless steel install hardware

Product Description

The Torque Solution High Flow Billet Thermostat Housing (TS-SU-755HF) replaces the OEM thermostat housing on Subaru EJ-powered WRX, STI, Forester XT, Outback XT, and Legacy GT models with a precision CNC machined 6061-T6 billet aluminum unit featuring a smooth, large tapered bore for optimized coolant flow. The factory housing is a common failure point - plastic and cast units crack over time from heat cycling, and their restrictive internal geometry limits coolant circulation in performance applications. The High Flow version steps up both durability and flow capacity in one upgrade.

The black anodized finish provides long-term corrosion resistance and a clean, premium look in the engine bay. Installation uses factory mounting points with included stainless steel hardware. Compatible with OEM and most aftermarket thermostats for EJ engines. Backed by Torque Solution's Limited Lifetime Warranty.