Set of 8 plugs NGK V-PowerTM Spark Plugs Advanced V-groove center electrode provides optimum performance and fuel efficiency required by today's lean-burning engines. OEM-Approved Design V-Groove Design Enhances Ignitability More Complete Combustion and Lower Emissions Racer's Choice for Performance Modern lean-burning, fuel efficient engines create a new set of requirements for spark plugs. NGK Spark Plugs answered the call for a spark plug with lower sparking voltage requirements by developing the V-Power, the only spark plug with a v-groove center electrode on the market today. Why is this important? The v-groove center electrode on a V-Power spark plug forces the spark to the outer edge of the ground electrode, placing it closer to the air/fuel mixture. What this does is allow the spark to more quickly ignite the mixture, providing more complete combustion. More complete combustion not only provides more power, it also means less harmful emissions. These emissions are not only damaging to the environment, they can reduce the life of expensive catalytic converters and oxygen sensors. V-Power Spark Plugs also require lower ignition firing voltage, resulting in quicker starts and easier cold weather starts throughout the life of the plugs. NGK V-Power Spark Plugs also are ideally suited for race cars and high performance street cars. Today's performance engines are high compression/high stress applications. Many are supercharged, turbo-charged or nitrous oxide fed. NGK's patented v-groove design allows the ignition system to easily spark in these dense air/fuel mixtures. The flame kernel will quickly grow and allow the engine to make more power since it now is operating more efficiently. As an added bonus, the v-groove forcing the spark to the outer edge of the ground electrode helps reduce the "quenching" effect, reducing misfires caused by high cylinder pressures "blowing out" the spark. NGK V-Power spark plugs are available for most American and Import cars and light trucks.