NGK Racing R5724-9 Spark Plugs

Four heat ranges colder than stock, gapped at .036

Ignitability of V-Power Spark Plugs
“NGK’s unique V-Power design directs the spark to the edge of the electrode where it can develop more rapidly. This allows easier and more complete combustion of the air/fuel mixture. The increased ignitability allows the engine to burn air/fuel ratios that would otherwise be too lean.”

V-Groove Explanation Quenching Effect
“The amount of spark which is absorbed by the center and ground electrode is referred to as the quenching effect. The V-Power plug is designed to draw spark to the edge of the electrode. Thus, the quenching effect is minimized, resulting in more effective, complete combustion.”