Koyo Aluminum Radiator - NSX, 1991-05

The Koyo Aluminum Radiator is a direct drop-in replacement for the factory radiator - ideal for replacing the factory radiator for street driven and track driven NSX. 

The Koyo radiator using a thicker than factory vertical single pass core with factory location inlet and outlet connections allowing easy installation to factory radiator hoses. It is the only drop-in style radiator made that does not require trimming or modification to the fans, fan shrouds, or other components for installation. The radiator features sculpted water tanks (see detailed photo) which allows the radiator to easily fit under the factory core support, mounting bosses for factory fan installation, mounting pins for factory mount locations, billet aluminum drain and bleeder fittings, as well as high quality TIG welded construction. ScienceofSpeed highly recommends this radiator against other less expensive overseas manufactured radiators which, in our experience, do not fit as well, use a poor quality core, and require modification to install.  This affects the originality of your NSX, and reduces the cooling performance compared to the Koyo radiator. 

We recommend replacing your coolant hoses as well if they haven't been replaced in 10+ years.  You can find the kits below:

Left Hand Drive kits

Right Hand Drive kits