SKU: 49348417269

ESR Competition Radiators (1999-2005)

Sale price$357.75 Regular price$397.50
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Description

ESR Competition Radiators (1999-2005)Originally built and designed by Sam Henry of Springfield Dyno. This is the latest revision to the most effective radiator in the Spec Miata marketplace. There's a reason that so many winners and champions use these radiators, they work better than anything else out there. They have been used on 6 of the last 7 national Championship winning cars. This is a true triple pass radiator which channels the water from side to side multiple times ensuring a

Originally built and designed by Sam Henry of Springfield Dyno. This is the latest revision to the most effective radiator in the Spec Miata marketplace. There's a reason that so many winners and champions use these radiators, they work better than anything else out there. They have been used on 6 of the last 7 national Championship winning cars.

This is a true triple pass radiator which channels the water from side to side multiple times ensuring a substantially longer cooling time in the radiator and pulling even more heat out of the cooling system. Many try to copy, but none have been nearly as effective.

Three main attributes for this radiator are:

  1. Reduced cooling system operating temperature. We have consistently seen 20-30 degrees cooler temperatures running this new radiator vs a 54mm Koyo radiator or a few of the other copies of our radiator.
  2. Reduced intake system air temperatures. During controlled dyno tests, we have seen 15-20 degree drops on intake air temps.
  3. Reduced weight off the nose of the car. Compared to the Koyo, this new radiator weighs approx. 2.5lbs less when fully filled.

The simple facts are that if you keep the coolant temps below 190 degrees, you are going to make more power. Also, if the intake air temp is cooler, you will also make more power.

This is really one of the must haves if you want to make power for a whole National race distance, even tucked up in a tight draft.

Comes with optional install kit, which includes:

  • Recommended 16lb flip lock radiator cap
  • Pre-cut Gates upper radiator hose

    Also comes with optional gauge fittings, two 1/8 npt and one 1/4 npt. Allows you to install your water temp guage sending unit directly into radiator with no chance of leaks. You can put in sensors for water temp and water pressure and warning on temp or pressure.

    99-05 use top hose dayco 71679

    Vehicle Applications:

    • 1999-2005 Mazda Miata 1.6L & 1.8L NB1 & NB2
    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: 49348417269

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    4.0 ★★★★★
    Based on 14 reviews
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    Michael Kyle.
    Natrona Heights, US
    ★★★★★ 5
    Made a great pillow better.
    Had an awesome pillow but if I didn't fluff it before going to sleep my neck would hurt the next morning. Ordered this and put about 70% into a cardboard box to expand then shoved it into my pillow. Its been great 👍 put the rest in another pillow. Had no scent. My pillows are king sized.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 8, 2026
    A
    Verified Purchase
    AgnesMarie Pezanetti
    Louisville, US
    ★★★★★ 5
    Great for refreshing old memory foam pillows
    Our memory foam pillows are 2 years old and need a little refreshing. We purchased this and was able to refresh both pillows to firmer than new condition.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on April 15, 2026
    A
    Ashley
    Omaha, US
    ★★★★★ 4
    Easy to use
    I recently got one of those large body pillows that people usually use for pregnancy. Unfortunately, it was a little understuffed for my liking, and it isn't stuffed/stitched in a way that keeps the filling from moving around. The filling was bunching in places and sparse in others, causing it to be uneven. Fortunately, the pillow had a cover, and the core had a zipper where I could easily access the stuffing. I decided to try this filling to make up for the gaps. It worked great. I grabbed the stuffing and put it directly into the pillow. I did not allow it to expand fully before stuffing. I probably should have. But this was super easy to use and absolutely solved my problem. It doesn't smell great. There is definitely some smell that could probably be cleared by leaving it to air out for a while. I stuffed it right into the pillow and didn't use it until later that night. It wasn't so strong that it could be smelled through the pillow covering and the pillowcase.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on September 17, 2025
    J
    Verified Purchase
    Jose Garcia
    Draper, US
    ★★★★★ 5
    Great for topping off bean bag
    Bought this to help top off/fill a bean bag chair we have and it was perfect!
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    Reviewed in the United States on April 6, 2026
    A
    Verified Purchase
    Allie Spizalizle
    San Leandro, US
    ★★★★★ 1
    Don't get that much
    It's not very much and they really suck... but it is what it is..
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on April 7, 2026

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