Mishimoto Aluminum Coolant Expansion Tank | Multiple Fitments (MMRT-WRX-08E)

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$204.95 $271.12Instant Savings of 24% ($66.17)

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Aluminum Coolant Expansion Tanks by Mishimoto

Rid your 2008-2014 WRX or 2005-2009 Legacy GT engine bay of the eyesore that is the stock expansion tank, and replace it with the Mishimoto aluminum coolant expansion tank.

The all-aluminum, fully welded construction of the Mishimoto expansion tank does more than dress up your engine bay. This tank also offers increased durability during repeated cold and hot transitions, and leak-free welded CNC barb fittings. In addition, the Mishimoto aluminum coolant expansion tank offers a 22% increase in fluid capacity over the factory expansion tank.

This direct-fit expansion tank upgrade is compatible with the stock Subaru and Mishimoto radiator caps, and is available either in polished silver, to match the Mishimoto Performance Radiator, or in Stealth Black. As with all our products, this expansion tank includes the Mishimoto Lifetime Warranty.


  • 22% greater capacity than stock plastic expansion tank
  • All-aluminum, fully welded construction for maximum durability during repeated cold and hot transitions
  • Leak-free welded CNC barb fittings
  • Fits with Mishimoto Subaru WRX Front-Mount Intercooler Kit
  • Fits with stock and Mishimoto radiator caps
  • Polished aluminum finish matches the Mishimoto Subaru WRX/STI Performance Aluminum Radiator
  • Mishimoto Lifetime Warranty

Please Note: This expansion tank may not fit with the stock air intake "S" hose, an aftermarket intake is recommended for the best fit. Mishimoto offers both the Performance Air Intake, and Performance Race Intake which are perfect for this application!


  • 2008 – 2014 Subaru Impreza WRX
  • 2005 – 2009 Subaru Legacy GT
  • 2005 – 2009 Subaru Outback XT
  • 2009 – 2014 Subaru Forester XT

What's In The Box?

  • 1 - Aluminum Expansion Tank
  • 1 - Mishimoto Radiator Cap
  • Mishimoto Lifetime Warranty


  • Mishimoto Lifetime Warranty

Customer Reviews

Based on 1 review
Jeremy B
Solid product

Reason I bought this was because my expansion tank was cracking, looks great installed. Only problem is if you have a Cobb short ram intake the expansion tank slightly touches the hose