Go for a Koyo and never look back.
just replaced rad and all soft and hardlines with oem hoses and koyo rad. gives me a lot of reassurance in this LA heat. Great upgrade
The Koyo Rad needs it's own custom cap as the OEM won't fit but man does track city daily without issue and fits OEM fans it's a must have.
The previous owner had replaced it with a really cheap plastic tank one. It started leaking about a month after I got the car so I spent the money and got an all aluminum Koyo. Its a happy miata now.
Koyo rad hands down best aftermarket replacement.
I would recommend the koyo radiator with stock fans. It’s been 3 years with mine zero issues it’ll run cool in 120 desert.
I would recommend a full aluminum koyo radiator. There are pricy but they fit like OEM and use the OEM fans. 2 years later with 15k and no issues.
Koyo has better fitment than Mishimoto tho, I think that's more important as they both have good warranty. One thing to note is the only radiator Koyo has for the DE that is OEM design is the larger one, the smaller one it the cross flow, which is better performance wise but puts the radiator cap on the passenger side. That's the one I currently have.
Im in AZ, and I was hitting up in the 225+ coolant after a Grimmspeed FMIC, and so I went ahead and upgraded to a koyo. Now I’m staying around 196-206 depending on situations. Highest I’ve seen is 208 or so.
Roughly 12 months ago, I upgraded the radiator on my 2000 Series 8 (~65,000km/40,000mi) to a Koyo R1443N 48mm N-Flow. The coolant seals blew because the radiator's design allowed air to accumulate, creating hot-spots and leading to seal failure. My water temps never exceeded 90C. After a rebuild, a valve was installed on the radiator elbow, making it quicker to bleed the system, and water temps are now around 77C, about 10C cooler than before. The Koyo radiator's design prevented proper bleeding of the coolant system, causing seal failure.
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