NGK extended reach plugs in heat range 6. Recommended for use on turbo or supercharged cars. Fits all NA/NB Miatas.
The extended reach means the burn starts closer to the center of the combustion chamber, giving improved efficiency and power. Every Miata should run extended plugs.
We recommend setting the gap to 0.040" for naturally aspirated engines and 0.028"-0.035" for boosted engines. Always verify the spark plug gap before installing - even if the manufacturer tells you that they come pre-gapped for your specific application.
Sold in sets of four. That's enough for one car.