Koyo 36mm Racing Radiator 1999-05 Mazda MX-5 Miata 1.8L (MT)Koyorad now has options for every MX 5 Miata chassis in the Mazda pedigree. Starting with the NA chassis all the way up to the new ND chassis, Koyo has the solution to keep your roadsters engine temps cool while shaving some weight and adding style to your engine bay. With over 50 years of experience in the manufacturing of OE replacement radiators, it was only natural that Koyorad develop a lightweight Aluminum, high performance radiator line. They