When choosing a radiator for your Miata there are two high performance models that are the most popular, PWR and KOYO. In normally aspirated applications the KOYO would be a great improvement over stock. KOYO also makes a larger 55 mm deep radiator, but we do not recommend it for any Miata application due to its size and weight. For high performance applications such as Superchargers and Turbos the PWR's outstanding features over the KOYO make it the TDR recommended choice of high performance radiators.

• Better Heat Transfer - 9 cooling fins per sq. in. verses 7 fins with the KOYO
• Larger Front Core – .625" taller core for increased cooling efficiency
• Larger Capacity – 1.588" deep verses 1.425" deep with the KOYO
• Shorter Fan Mounting Post – .500" verses .700" with the KOYO for more efficient fan cooling
• 16 lb. High Performance Radiator Cap – PWR supplied only, extra with the KOYO
• TDR Air-to-Air Intercooler Approved for all year models – (KOYO may be used for '99-05 models only)