SKU: 46732044864

Supercool Low Temp High Flow Thermostat EJ20 / EJ25

Sale price$61.20 Regular price$68.00
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Ships within 48 hours · Estimated delivery Jul 11 - Jul 16

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For Your Every Summer RSVP, with Code: SUMMER15

Description

Supercool Low Temp High Flow Thermostat EJ20 / EJ25The Fuji Racing Supercool Thermostat has been in testing for most of 2022, now we are finally ready to release it to the public. With the Fuji Racing Supercool thermostat in place, your engine coolant is allowed to circulate around the engine much earlier which allows overall engine temperatures to be reduced sooner than they would normally occur. Your coolants job is to carry heat out of the engine, take it through your radiator, and then flow it

The Fuji Racing Supercool Thermostat has been in testing for most of 2022, now we are finally ready to release it to the public.

With the Fuji Racing Supercool thermostat in place, your engine coolant is allowed to circulate around the engine much earlier which allows overall engine temperatures to be reduced sooner than they would normally occur. Your coolant’s job is to carry heat out of the engine, take it through your radiator, and then flow it back into the engine at a reduced temperature to when it left. This entire process is controlled by the thermostat, having a thermostat open at a lower temperature than OEM allows the coolant to flow through the radiator quicker and longer.

The Fuji Racing Supercool Thermostat operating temprature is 71c. OEM Subaru opening temps for turbo models are 78c & Naturally aspirated models are 82c. The Fuji Supercool thermostat also features a larger opening than OEM to allow for more flow through the thermostat. Fuji Supercool 41mm Opening. OEM Subaru 39mm opening.

Testing was done on a 2005 WRX STi 2.1 stroker, we had a mix of daily driving & full-day track days (over 6,000 miles combined), coolant temps never went over 95c on a 30c summers day and daily driving was no different to an OEM thermostat. heaters worked as they should, coolant temperatures were stabilized and didn’t fluctuate. It had an OEM standard coolant radiator fitted, OEM cast impeller water pump, fuji supercool thermostat, Front mount intercooler & front mounted oil cooler. The coolant used was standard millers alpine antifreeze.

Suitable for the following models:

  • All Subaru EJ Engines
  • All Subaru EZ H6 Engines

If you are unsure of fitment or application then please contact us with your vehicles chassis number.

Kit Includes 

  • 71c Supercool High Flow Thermostat
  • Seal

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 46732044864

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Allen
Chelsea, US
★★★★★ 5
Power steering leak
Worked great. No problem at all.
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Reviewed in the United States on January 16, 2026
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ChrisA
Boise, US
★★★★★ 5
perfect fit for 2005 acura rsx s-type
Why did you pick this product vs others?: fixed my PS pump leak fast.
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Reviewed in the United States on July 7, 2025
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J.P.
Phoenix, US
★★★★★ 5
So good. No more whine!
Worked like a charm on a 2007 & 2009 Accord 4cyl
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Reviewed in the United States on December 18, 2025
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Placeholder
Alexandria, US
★★★★★ 4
No instructions
No instructions... No idea which one is the high pressure side.They seem to be good quality but I have not used them yet...
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Reviewed in the United States on December 3, 2025
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Turbeau
Cuba, US
★★★★★ 5
Great fit for a 2005 Honda Element
These fit my 2005 Honda Element perfectly. Solved a small leak issue. I’ve had these installed for about one season so far (winter into summer) and they are still holding up. The install is simple if you’re confident working on your power steering system. Overall happy. No complaints
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Reviewed in the United States on May 13, 2026

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