- Direct fit for the 2016–2018 Ford Focus RS / 2013-2018 Ford Focus ST
- Sight tube allows for proper hot and cold coolant levels
- Internal baffle keeps coolant near overflow port during aggressive driving, preventing air entry into coolant system
- 100% aluminum, fully-welded construction for maximum durability during repeated temperature transitions
- Overflow nipple on fill neck allows for installation of additional NHRA-mandated overflow reservoir
- Fits with stock overflow tank cap
- Available in Wrinkle Nitrous Blue, wrinkle red, or black powder-coated finish
- Mishimoto Lifetime Warranty
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+ 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.
(1) Aluminum Expansion Tank w/ Sight Tube
(1) Overflow Hose
(2) Rubber Sleeves
Mishimoto Lifetime Warranty
After a few hot and cold cycles, Mishimoto recommends checking the sight tube on the side of the expansion tank to confirm proper coolant level.
- TECH SPECS
Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.
For our complete warranty policy, please click here.
Q:After going over the installation guide, video, and item description, I just wanted to ask what do you do with the overflow nipple hose if you don’t have an additional coolant tank? Do you leave it pointing downward like in the video? I’m guessing there is something there that keeps it from spilling but I just wanted to ask since the video was mum about it.A:
Thanks for reaching out to us. This overflow nipple is designed to be vented to atmosphere as Ford does on some of their vehicles. If you had an additional expansion tank, you could install it in line with ours. However, this configuration is safe for your vehicle.
Please feel free to reach out to us at email@example.com and we would be happy to assist further.
ChrisBY:Christopher Black (Admin) | Dec 7, 2017