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 Aug 4 - Aug 9

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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:
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  • 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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4.5 ★★★★★
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Carol Foshag
Battle Creek, US
★★★★★ 5
Well made
Size: Large, Color: Black (6-pairs), Number of Items: 6
These are the only socks that my 12 year old Grandson will wear. He's very picky. LOL
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Reviewed in the United States on March 2, 2026
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Kiersten
Waukegan, US
★★★★★ 5
Comfort and durability
Size: Large, Color: White (6-pairs), Number of Items: 6
Socks work really good. I have very rough and dry feet that tear up my bed sheets. They hold up to my destructive feet. They are soft and comfy!
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Reviewed in the United States on December 14, 2025
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Verified Purchase
LC
San Leandro, US
★★★★★ 5
LOVE THEM!!
Size: Small, Color: (001) Black / Black / Castlerock
LOVE! These socks are so comfortable! I wear a 5 in women's and a 3 in big kid shoes. The small fit me perfectly. I see where some say they run small but I can't say that was an issue for me. They are "snug" but thats what you want with a no show sock. I feel they have support vs the ones i used to buy at Walmart. They are very soft! I am actually buying more today and throwing my other ones in the trash!
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Reviewed in the United States on February 18, 2026
L
Verified Purchase
Lucy Mejia
Cuba, US
★★★★★ 5
So will not write down your foot
Size: Medium, Color: (001) Black / Black / Castlerock
I love these socks. They have a little bit of gel on the top of the heel for support in your tennis shoes and so your socks don’t write down. Very good quality.
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Reviewed in the United States on May 6, 2026
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Verified Purchase
Twins9
West Palm Beach, US
★★★★★ 5
Comfy and Stay Put
Size: Medium, Color: (002) Black / Black / Halo Gray
These socks are honestly great. They’re super thin and light, so once you have them on, you kind of forget they’re even there. No bulky feeling in your shoes at all. The best part is they actually stay on. I hate no-show socks that slide down after five minutes, and these don’t do that. The little grip on the heel really works, so you’re not constantly adjusting them all day. They’re breathable too, which is nice if your feet run warm. They dry fast and don’t get that gross sweaty feeling. And there’s no annoying seam on the toe, so nothing rubs or feels uncomfortable. Basically, they’re just comfy, stay put, and don’t cause problems — which is all I want from socks.
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Reviewed in the United States on January 16, 2026

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