Mishimoto Aluminum Coolant Overflow Tank

Part #: MMRT-STI-08

Overview

The Mishimoto Aluminum Coolant Overflow Tank is a high-quality replacement designed specifically for 2008 and newer Subaru WRX and STI models. Crafted from durable TIG-welded aluminum, this overflow tank offers a significant upgrade over the stock plastic component, providing enhanced longevity and resistance to the thermal stresses of engine operation. It is ideal for enthusiasts seeking a reliable, visually appealing solution that improves engine bay aesthetics and durability. This tank helps prevent failure caused by repeated thermal cycling, reducing the risk of leaks and cracks that can occur with factory plastic units. Its sleek aluminum construction not only supports better heat dissipation but also adds a refined look to your engine bay, making it a perfect choice for both daily drivers and show cars.

Key Features

This overflow tank features a precision CNC-machined dipstick for easy and accurate coolant level checks, ensuring maintenance is straightforward. The aluminum construction is TIG-welded for strength and durability, resisting corrosion and heat-related wear. Its design is tailored to fit seamlessly into the Subaru WRX/STI engine bay, replacing the factory plastic tank with a robust, long-lasting alternative. The tank’s sleek finish complements the engine bay’s aesthetic, while its functional design supports reliable coolant management during high-performance driving or daily use. The included hardware ensures a straightforward installation process, making it a practical upgrade for your vehicle.

Construction & Design

Constructed from high-grade aluminum with TIG welding, this overflow tank is engineered for durability and heat resistance. Its CNC-machined dipstick provides precise coolant level readings, and the overall design emphasizes both form and function, ensuring a perfect fit and long-lasting performance.

Installation & Fitment

Designed specifically for 2008+ Subaru WRX and STI models, this overflow tank replaces the stock plastic unit with a direct bolt-on upgrade. Installation typically involves removing the factory tank and securing the Mishimoto aluminum version in its place, with no additional modifications required.

What’s Included

The package includes the aluminum coolant overflow tank, CNC-machined dipstick, and all necessary mounting hardware for a complete, hassle-free installation.

Ideal For

This product is ideal for Subaru WRX/STI owners looking to enhance engine bay durability, improve heat management, and achieve a cleaner, more refined engine appearance. It’s perfect for enthusiasts who want a reliable upgrade that combines function with style.