Mishimoto Aluminum Overflow Tank Polished Subaru BRZ FRS

The Mishimoto Aluminum Overflow Tank Polished Subaru BRZ FRS delivers a durable, corrosion-resistant replacement for the stock plastic overflow tank, improving long-term reliability under repeated thermal cycling.

Designed by Mishimoto for 2013+ BRZ / FR-S / GT86 applications, this polished aluminum overflow tank addresses a common failure mode of OEM plastic tanks, which can degrade or swell after repeated hot and cold cycles.

• Polished aluminum construction — provides a metal alternative to factory plastic, reducing risk of heat-related swelling or cracking over time.
• Application-specific fit — engineered for 2013+ Subaru BRZ / Toyota FR-S / GT86 platforms to integrate with the vehicle’s existing coolant routing and mounting points.
• Mishimoto engineering and reputation — leverages Mishimoto’s focus on thermal management to offer a direct-replacement component intended to extend service life compared with stock parts.

Functionally, the overflow tank captures excess coolant during high-temperature events and returns coolant to the system as the engine cools, maintaining proper coolant levels and system pressure balance. Replacing the OEM plastic tank with a polished aluminum unit mitigates a commonly observed failure mode without changing the coolant system’s intended operation.

Installation notes: this product is a like-for-like replacement for the specified models and is intended to use the vehicle’s existing hoses, clamps, and mounting hardware unless otherwise required by the installer.

Manufacturer: Mishimoto