These plugs utilize both Iridium and Platinum for utmost performance for high-power, high-boost race applications. PRO Iridium Plugs add a Platinum ground electrode ensure even longer life in even the most extreme driving conditions. The Pro Plugs are geared toward high horsepower, higher boost applications and extra long life. Please keep in mind that the plugs are available in heat ranges of 9, 10 and 11.

We will process your order as soon as the heat range and plug type is verified.