All Aluminum Racing Radiator

The Koyo 99-05 Mazda MX-5 Miata 1.8L (MT) Radiator is a high-performance, all-aluminum cooling solution designed for specific Mazda Miata models. Updated for 2015 with a 36mm Hypercore, this radiator is manufactured in Japan to exacting standards, evident in its superior Heliarc soldering, perfectly aligned tubes and fins, and a polished, mirror-like finish. A new drain plug is included, though a new radiator cap is sold separately. The 36mm core offers a balance between cooling efficiency and fitment, often allowing installation with thicker aftermarket sway bars without requiring modifications to the fan shrouds, making it a favored choice for Spec Miata racers dealing with overheating. This Koyo radiator is specifically intended for manual transmission Miata models from 1999 to 2005. Owners of the 2004-2005 MazdaSpeed Miata may need to modify brackets for the factory AC condenser to ensure proper clearance due to the larger radiator core. Installation notes suggest that while the condenser can be bent or the assembly moved forward, care must be taken to prevent the condenser from damaging the new radiator.