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.
Replaced OEM with a mishi, Fitment is good part reason I went with it was I replaced the fans with mishimoto fans and it all slid in nicely
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.
Mine developed a small slow leak out of that nub two weeks after I bought it. Koyo gave me the run around on their warranty, insisting on photos of a destroyed radiator for replacement. I gave up. It’s a shame because it fit awesome and looked great.
2012 Golf R (FSI) and just recently had a Mishimoto radiator installed. Car behaves normally on the road but the first track event after having it installed it got very warm (about halfway between normal and red zone on factory gauge) and actually spit out some coolant under the hood I found once back in the paddock. Shop has checked everything out, re-bled the system and found no air but does start to get hot under sustained boost. Funny thing is I track the car heavily and never had this issue on the OEM radiator, also the water pump was recently changed with timing service and has less than 1000 miles on it.
especially NOT a mishimoto. that shit is junk and i speak from experience.
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