Mishimoto Aluminum Expansion Tank for 2013-2018 Ford Focus RS and ST – Black

Add some reliability and engine bay styling to your Focus RS/ST with the Mishimoto RS/ST expansion tank. This tank features internal baffles to prevent coolant starvation from overflow ports on the engine. Also, during high speed cornering, braking, and acceleration, the internal baffles reduce coolant sloshing. The engineers at Mishimoto have included a sight tube to allow for proper observation of hot and cold coolant levels, making engine maintenance much easier.----Eventually, you'll have to consider the health of your plastic expansion tank. Plastic is prone to failure after years of constant temperature variations. The Mishimoto tank is constructed from durable, TIG-welded aluminum for optimal durability and longevity. It reuses the stock expansion tank cap and includes an overflow nipple on the fill neck for adding an additional coolant tank so your Focus RS stays NHRA legal. All areas of concern are covered with this upgrade.----It's worth noting the Focus's stock tank is an engine bay eye sore, whereas the Mishimoto tank comes in three different variants to help with aesthetic customization: black, wrinkle red, or Wrinkle Nitrous Blue. Each of these options works with both the 2013-2018 Focus ST and the new 2016-2018 Focus RS. For convenience, you can install your new coolant tank upgrade in under one hour as it was engineered with perfect fitment in mind. Like all our Focus RS parts, this expansion tank also includes the Mishimoto Lifetime Warranty. 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.

• Internal baffle keeps coolant near overflow port during aggressive driving, preventing air entry into coolant system
• Sight tube allows for proper hot and cold coolant levels
• Installs in under one hour

Enhance your Ford Focus RS or ST with the Mishimoto Aluminum Expansion Tank, designed for durability and optimal engine bay aesthetics. Constructed from TIG-welded aluminum, this expansion tank offers superior resilience against heat and pressure, reducing the risk of leaks and extending service life compared to traditional plastic tanks. Its sleek black finish adds a modern touch to your engine bay, replacing the stock plastic reservoir with a robust aluminum alternative that maintains a clean, professional appearance.
Featuring internal baffles, the Mishimoto tank prevents coolant starvation during aggressive driving maneuvers such as high-speed cornering, braking, and acceleration. These baffles also minimize coolant sloshing, ensuring consistent coolant flow and reducing air entrapment in the system. The included sight tube allows for easy monitoring of hot and cold coolant levels, simplifying maintenance and troubleshooting. The design incorporates a reusable stock cap and an overflow nipple on the fill neck, enabling the addition of an extra coolant tank to meet NHRA regulations, making this upgrade suitable for both street and track use.
Installation is straightforward, with a perfect fitment engineered for quick setup—typically under one hour. The Mishimoto expansion tank is compatible with both the 2013-2018 Ford Focus ST and the 2016-2018 Focus RS, offering an aesthetic upgrade that complements your vehicle's engine bay. Available in three colors—wrinkle red, wrinkle blue, or black—these tanks allow for customization to match your build. Backed by Mishimoto's lifetime warranty, this expansion tank provides a reliable, long-term solution for maintaining optimal coolant system performance and enhancing your vehicle’s appearance.

Features:

• Durable TIG-welded aluminum construction resists heat and pressure

• Internal baffles prevent coolant starvation and reduce sloshing during aggressive driving

• Sight tube for easy monitoring of hot and cold coolant levels

• Includes overflow nipple for additional coolant tank installation

• Reuses stock cap for seamless installation

• Fits 2013-2018 Ford Focus ST and 2016-2018 Focus RS models

• Available in black, wrinkle red, or wrinkle blue for customization

• Engineered for quick installation, typically under one hour

• Backed by Mishimoto’s lifetime warranty

Fitment:
2013 Ford Escape S
2013 Ford Escape SE
2013 Ford Escape SEL
2013 Ford Escape Titanium
2013 Ford Focus Electric
2013 Ford Focus S
2013 Ford Focus SE
2013 Ford Focus ST
2013 Ford Focus Titanium
2014 Ford Escape S
2014 Ford Escape SE
2014 Ford Escape Titanium
2014 Ford Focus Electric
2014 Ford Focus S
2014 Ford Focus SE
2014 Ford Focus ST
2014 Ford Focus Titanium
2014 Ford Transit Connect Titanium
2014 Ford Transit Connect XL
2014 Ford Transit Connect XLT
2015 Ford Escape S
2015 Ford Escape SE
2015 Ford Escape Titanium
2015 Ford Focus Electric
2015 Ford Focus S
2015 Ford Focus SE
2015 Ford Focus ST
2015 Ford Focus Titanium
2015 Ford Transit Connect Titanium
2015 Ford Transit Connect XL
2015 Ford Transit Connect XLT
2016 Ford Escape S
2016 Ford Escape SE
2016 Ford Escape Titanium
2016 Ford Focus Electric
2016 Ford Focus RS
2016 Ford Focus S
2016 Ford Focus SE
2016 Ford Focus ST
2016 Ford Focus Titanium
2016 Ford Transit Connect Titanium
2016 Ford Transit Connect XL
2016 Ford Transit Connect XLT
2017 Ford Focus Electric
2017 Ford Focus RS
2017 Ford Focus S
2017 Ford Focus SE
2017 Ford Focus SEL
2017 Ford Focus ST
2017 Ford Focus Titanium
2017 Ford Transit Connect Titanium
2017 Ford Transit Connect XL
2017 Ford Transit Connect XLT
2018 Ford Focus Electric
2018 Ford Focus RS
2018 Ford Focus S
2018 Ford Focus SE
2018 Ford Focus SEL
2018 Ford Focus ST
2018 Ford Focus Titanium
2018 Ford Transit Connect Titanium
2018 Ford Transit Connect XL
2018 Ford Transit Connect XLT
2019 Ford Transit Connect Titanium
2019 Ford Transit Connect XL
2019 Ford Transit Connect XLT
2020 Ford Transit Connect Titanium
2020 Ford Transit Connect XL
2020 Ford Transit Connect XLT
2021 Ford Transit Connect Titanium
2021 Ford Transit Connect XL
2021 Ford Transit Connect XLT

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1