I got a Koyorad and 0 issues with overheating with hard driving! Coolant stays at operating temp no matter what.
Reviews of KOYORAD parts For Business
Japan
koyorad on my 400hp Focus and never had over heating issues.
I replaced my 2010 factory Calsonic with a Kyorad 2807, there were lots of favorable comments on thenewx forum. 18 months later, still going.
I had read about people having good luck with the Kyorad brand so that's what I bought.
On my Miata with the factory flawed OEM coolant routing, I run a Koyorad 36mm aluminum radiator with OEM fans and it keeps temps a bit cooler than stock.
I changed out the intake (noise maker but I love it) then everything that connects so the turbo inlet and bpv, charge pipe and a bigger tmic. A engine that can breath will be healthy.
This specific spot fails on almost every subaru radiator i have worked on.
If you are lucky KoyoRad still has their sale going, I just got an aluminum radiator from my 97 legacy for $180
The radiator you could go OEM or NVA, but Koyorad is proven solid also.
I went with a Koyorad, but for how much I’ve spent, I should have gone with a crossflow (either Supermiata or Flyin Miata). I also did a coolant reroute, which made me really regret not getting a crossflow
The cap which came on the Koyorad is probably a two way cap. If so it needs to be replaced with a Subaru one way cap.
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Owner reviews of KOYORAD products
The KOYORAD brand is registered in Japan. Official website: http://www.koyorad.co.jp/ .
In March 2026, PartReview recorded 42 reviews across 2 parts by KOYORAD. Average rating — 2.8 out of 5.
KOYORAD is in the PartReview manufacturers ranking, currently at position 185. Over the last 30 days it dropped by 0 points.
Popular KOYORAD parts
The most popular KOYORAD products on PartReview:
- Engine radiator KOYORAD - 41 review. PR Score — 94, average rating — 4.5.
- Radiator cap KOYORAD - 1 review. PR Score — not available yet, average rating — 1.
Most owner reviews about KOYORAD parts are collected on these pages.
Top-rated KOYORAD parts
KOYORAD achieved top positions in these PartReview part rankings:
- Best engine radiator — ranked 2 among 9 manufacturers. Received 1069 votes.
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