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Heating and Cooling› Overflow Tanks and Catch Cans

Mishimoto

Mishimoto 08+ Subaru WRX/STI Black Aluminum Coolant Overflow Tank

$257.00 $233.00 Save $24.00

SKU: M00C MMRT-STI-08BK

In Stock
In Stock
Ships by Aug 30
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Mishimoto Aluminum Coolant Overflow Tank is a direct-fit replacement designed for 2008-2021 Subaru WRX and STI models. This overflow tank offers enhanced durability over the stock plastic tank and provides a clean, professional look for your engine bay.

Constructed from fully TIG-welded aluminum, it features a CNC-machined dipstick for easy coolant level monitoring. Installation is straightforward and can be completed in under 30 minutes without requiring modifications. It is available in a black anodized finish and pairs well with stock or Mishimoto radiators.
Show original supplier description

Part #: MMRT-STI-08BK

Get that plastic blob of an overflow tank out of your engine bay. Stock plastic tanks are prone to failure due to repeated hot and cold cycles, and they create a horrible eyesore as they lurk in your engine bay. Mishimoto's 2008+ STI / WRX coolant overflow tank is constructed from durable, TIG-welded aluminum for optimal durability and longevity. Included with this STI / WRX coolant overflow tank is a CNC-machined dipstick to allow for easy checking of coolant levels. With the choice of two finishes, polished and anodized black, this tank will have no problem matching the style of your engine bay. This STI / WRX coolant overflow tank fits perfectly with the stock or Mishimoto STI / WRX radiators. As with all Mishimoto STI and WRX parts, this overflow tank includes the Mishimoto Lifetime Warranty.

Features:

  • Direct fit for the 2008+ Subaru WRX and STI
  • Installs in under 30 minutes
  • All-aluminum, fully welded construction for maximum durability
  • Dipstick allows for proper cold coolant levels
  • Available in polished or anodized black

Engine coolant reservoir designed to store and regulate excess coolant for proper system operation. Durable construction resists heat and pressure, helping prevent leaks and maintain optimal temperature.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandMishimoto
Part NumberM00C MMRT-STI-08BK

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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