i went with a Koyorad SKU: 910-371 for my NB from Moss. I live in hot sunny florida, and took it to the track a few times. never an issue. i just drove it hard to the hardware store.
Later I came across a deal for a Mishimoto radiator and had that installed. I’ve had no issues with my Mishimoto, and I bought it before seeing most recommending the Koyo Radiator over Mishimoto.
I'd go with Koyo for price and ease of install. My reservoir hose nipple broke on my OEM radiator (OEM has plastic tanks) so I went with all aluminum for durability. My RX-8 also only drives on race tracks, so the extra cooling is nice.
In my particular situation I went with the Mishimoto radiator. Idk why it gets so much flak. Had no issues with install and it has been great. Now I use my 8 for autox so I needed the extra cooling. I can say that last weeks event it was 89 degrees out and even after a 2 hour drive and fielding for 4 mins to make my run; my ect was 200.
I'd replace it with a fully aluminum one just because of that pesky plastic nipple that's prone to breaking. Koyo makes a good one.
My NA 1.4 OE failed (long time ago) because of aluminium tubing corrosion (brine). So replacement Valeo got paint treatment . So far 100k km without problems.
I’ve had really good luck with Koyo radiators in the past as a really good replacement. The couple all aluminum radiators I’ve had, I really wasn’t impressed with the quality of construction.
I do have the Mishimoto triple pass rad but it was similar with the stock one.
Mazda tech here, we hate them. Watched my foreman pull the entire front clip off of a phev one just to replace a cracked radiator at 2k miles.
I would never pay someone money to install a Duralast (AutoZone house brand) radiator, or any other Duralast part. You’ll be back, hopefully before the warranty on that radiator expires. I used to put that crap on my vehicles. I learned, and I stopped.
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