Mishimoto Performance Aluminum Radiator Manual Transmission

2015-2021 Subaru STI

Ships for free in the 48 states

SKU: MMRAD-STI-08We price match!

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The Performance Aluminum Radiator will improve the coolant efficiency in the Subaru STI. 
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Mishimoto Performance Aluminum Radiator

Radiator Specs:

  • Full aluminum construction provides increased heat and pressure tolerance, improved heat dissipation, increased durability and improved cooling efficiency
  • Manufactured with TIG-welded end tanks for improved strength and extended service
  • 100% brazed aluminum core for maximum reliability
  • Increased coolant capacity directly results in improved cooling efficiency
  • Included 1.3 BAR radiator cap raises the boiling point of engine coolant to provide a safer and more efficient system
  • Designed to original equipment specifications
  • Designed for manual transmission models



  • The radiator cap provided with this particular radiator should replace the stock cap that is located n the expansion tank - Your factory issued/stock radiator cap should be the one used on the Mishimoto Radiator
  • The Mishimoto radiator cap is a two-way valve, and when compared to the stock single valve, there is a difference in construction, and cannot be used on the radiator
  • If you try to use the provided Mishimoto cap on the radiator, then you risk overheating


Mishimoto Performance Aluminum Radiator

This is the end-all-be-all of radiators. This is because of the all-aluminum construction, the Mishimoto Performance Aluminum Radiator is durable while improving the overall cooling efficiency of your vehicle. Mishimoto also engineered this radiator with improved heat and pressure tolerances which are the main killers of the OEM radiator. 

Over time and mileage, the pressure buildup and daily heat cycles take a toll on the OEM radiator, especially on the plastic top tank. What happens is that eventually, a hairline crack will occur on the upper tank which will cause a leak that can lead to overheating. If you're in this situation, the Mishimoto all-aluminum construction will provide your vehicle with a durable unit to provide your vehicle with long-lasting performance. 


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