Mishimoto MMB-WRX-004 Ultimate Cooling Bundle for Subaru STI 2008-2014

The Mishimoto MMB-WRX-004 Ultimate Bundle is a comprehensive cooling system overhaul kit engineered to replace all primary failure-prone cooling components at once, eliminating vehicle downtime and protecting your STI's EJ engine from heat-related damage. This all-in-one solution bundles seven upgraded performance components into a single direct-fit package.

What's Included:

• Performance Aluminum Radiator – Full aluminum construction with durable TIG-welded end tanks provides an increase in coolant capacity for superior heat dissipation and improved cooling efficiency over the factory plastic-tank unit.
• Performance Aluminum Fan Shroud – Maximizes airflow through the radiator core to supplement cooling efficiency, especially at low speeds and idle.
• Silicone Radiator Hose Kit (Black) – Constructed from high-grade 4-ply silicone with heat-resistant embedded fibers for superior heat and pressure tolerance over OEM rubber hoses.
• Racing Thermostat – Features a lower activation temperature of 154.4°F compared to the factory unit's 172.4°F, allowing coolant to circulate through the engine earlier and reducing the risk of overheating in demanding environments.
• Aluminum Coolant Expansion Tank – Fully TIG-welded all-aluminum construction provides maximum durability through repeated thermal cycling.
• Aluminum Overflow Tank – Matching all-aluminum, TIG-welded design for consistent performance and long-term reliability.
• Thermostatic Oil Cooler Kit – A direct-fit 19-row cooler that mounts in the front bumper for optimal airflow, proven to reduce oil temperatures by 20°F or more — ideal for track use and aggressive street driving.

Together, these components address every major cooling system vulnerability in the 2008–2014 Subaru STI, from coolant capacity and flow to oil temperature management. The bundle is ideal for daily drivers, weekend warriors, and track day enthusiasts looking to build a more reliable and thermally efficient STI.

All components in the Mishimoto Ultimate Bundle MMB-WRX-004 are covered by the Mishimoto Lifetime Warranty.