Mishimoto Aluminum Coolant Expansion Tank Black 2002-2007 WRX / 2004-2016 STI | Cooling System Upgrade | Direct Replacement
Overview
The Mishimoto Aluminum Coolant Expansion Tank is a high-quality upgrade designed specifically for Subaru WRX and WRX STI models from 2002 to 2007 and 2004 to 2016, respectively. This premium aluminum tank replaces the OEM plastic unit, offering enhanced durability and a sleek, anodized black finish that complements your engine bay’s aesthetic. Built for enthusiasts who demand reliability under high heat and pressure, this expansion tank helps maintain optimal coolant levels during aggressive driving, track days, or spirited canyon runs. Its larger capacity ensures your cooling system can handle increased thermal loads, reducing the risk of overheating and promoting consistent engine performance.
Designed with a focus on engineering excellence, Mishimoto’s aluminum tank features TIG-welded construction and barbed fittings for a secure, leak-free fit. The straightforward installation process makes it a perfect direct replacement for the stock component, requiring no modifications. Whether you’re building a reliable daily driver or a high-performance Subaru, this expansion tank offers a perfect blend of form and function. It not only improves cooling efficiency but also adds a subtle visual upgrade to your engine bay, emphasizing your commitment to quality and performance.
For Subaru owners pushing their cars harder—whether through tuning, increased boost, or track use—this Mishimoto expansion tank provides peace of mind. Its larger capacity helps prevent coolant boil-over and maintains consistent coolant levels, essential for sustained performance. Plus, the durable aluminum construction resists cracking and warping over time, making it a long-lasting upgrade that supports your Subaru’s cooling needs for years to come.
Features & Specifications
This Mishimoto coolant expansion tank is engineered for WRX and STI platforms and features a larger capacity to support high-performance cooling. Constructed from TIG-welded aluminum, it delivers increased durability and heat resistance for demanding driving conditions.
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Brand: Mishimoto
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Product: Aluminum Coolant Expansion Tank Black 2002-2007 WRX / 2004-2016 STI
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Part Number: (Check specific application for part number)
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Fitment: Subaru WRX (2002-2007), Subaru WRX STI (2004-2016)
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Material: TIG-welded Aluminum
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Finish: Anodized Black
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Construction: TIG-Welded
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Origin: Designed and manufactured by Mishimoto
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Capacity Increase: 50% larger than OEM
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Compatibility: Fits with stock or Mishimoto radiator caps
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Installation: Direct replacement, no modifications required
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Fittings: Barbed fittings for secure hose connection
Key Benefits
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Enhanced Durability: Aluminum construction resists cracking and warping, providing long-term reliability under high thermal stress.
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Improved Cooling Performance: Larger capacity helps maintain consistent coolant levels, reducing overheating during aggressive driving or tuning.
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OEM+ Aesthetic: Sleek black anodized finish adds a refined look to your engine bay, elevating your Subaru’s appearance.
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Easy Installation: A straightforward bolt-on upgrade that requires no modifications, making it accessible for DIY enthusiasts.
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Support for Tuning & Performance: Better coolant management supports increased power output and prolonged engine health during tuning or track use.
What's Included
- 1× Mishimoto Aluminum Coolant Expansion Tank Black
- Mounting hardware (if applicable)
- Gaskets/seals (if included in packaging)
- Installation instructions
Installation & Compatibility
This Mishimoto coolant expansion tank is designed for a straightforward installation, making it suitable for DIY Subaru owners with basic mechanical skills. It bolts directly in place of the OEM plastic tank, with no modifications needed. The process involves removing the stock tank, transferring any necessary fittings, and securing the new aluminum unit. Basic hand tools are sufficient, but always follow the included instructions for proper fitment.
Compatibility is confirmed for 2002–2007 WRX and 2004–2016 STI models. It fits with stock or Mishimoto radiator caps, but verify your specific vehicle’s configuration before installation. While the tank is a direct replacement, tuning or coolant system checks are recommended if your Subaru has been heavily modified or tuned for high-performance driving. This upgrade is ideal for enthusiasts seeking a reliable, visually appealing cooling component that supports their performance goals.
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