NGK Racing Spark Plug Box of 4 (R7438-9)

This is a box of four NGK R7438-9 racing spark plugs. These plugs are built specifically for the demands of racing, designed to handle the intense conditions found on the track. The center electrode features special designs to ensure it holds up under stress and ignites fuel reliably, which is crucial when every bit of performance counts.

NGK uses a trivalent metal plating on these plugs, which helps prevent corrosion and seizing, making installation and removal easier, even after hard use. The insulator is made from pure alumina silicate ceramic, offering solid strength and efficient heat transfer away from the plug tip. This design, along with special insulator nose shapes, helps improve throttle response, giving you a more immediate reaction from your engine. They also feature corrugated ribs to prevent flashover and a copper core for better heat removal, all sealed with triple seals to prevent leaks.

Because these are specialized racing plugs, they are intended for racing use only. Always refer to your vehicle's service manual or NGK's fitment guide to ensure these are the correct plugs for your specific racing application.