Economical performance and improved ignitability over standard NGK Spark Plugs original equipment manufacturer and racer approved. R5671A-9

Description:

- Lowers ignition system voltage requirements

- Greater ignitability and performance over conventional spark plugs

- Trivalent Metal Plating has superior anti-corrosion and anti-seizing properties

- Increased fuel economy and lower emissions

- Highly durable against electrical and chemical wear

- Good performance spark plug

Note: Recommended for 500+hp engines. Comes with set of 4