After breaking off a nipple on my stock radiator, it’s clearly time for an upgrade. After some research it seems that a 2 pass Koyo Radiator should be great, though I was a little apprehensive because of all the comments about it not cooling correctly at idle. Well, it does. In fact, I’m pretty sure a lot of these comments are related to the gap that surrounds the fan shrouds which need to be filled in for it to actually pull air through the radiator instead of simply going around it. I live in Las Vegas and the Rx8 Koyo radiator allows me to sit in traffic in 110 degree weather with the A/C working and my Rx8 does not overheat.
Sorry about the picture quality, I replaced my camera soon after this after seeing just how bad the pictures came out.