R5671A-9 Racing Spark Plugs 5238 | Set of 8 | Performance Plugs for Race & High Compression Engines

Upgrade your race engine’s ignition system with the R5671A-9 Racing Spark Plugs (5238) – Set of 8. Designed for high-compression, turbocharged, and high-RPM engines, these plugs provide a strong, consistent spark for maximum combustion efficiency. Featuring a copper core center electrode, the R5671A-9 spark plugs deliver superior heat dissipation, reducing the risk of pre-ignition and detonation in high-performance applications. With a heat range of 9, these plugs are ideal for engines requiring colder spark plugs to handle increased cylinder pressures and extreme temperatures. Trusted by professional racers and performance enthusiasts, these racing spark plugs ensure durability, reliability, and optimized engine performance. Whether you're building a race car, upgrading a high-boost setup, or tuning for peak horsepower, this set of 8 NGK R5671A-9 spark plugs delivers the ignition power you need.

• Designed for High-Performance & Racing Applications – Ideal for high-compression, forced induction, and high-RPM engines, delivering maximum spark efficiency under extreme conditions.
• Racing Series for Maximum Ignition Performance – The R5671A-9 spark plugs provide a strong, consistent spark, improving combustion efficiency and overall engine power.
• Copper Core for Superior Heat Dissipation – Features a copper core center electrode, allowing for better thermal conductivity and heat control, reducing the risk of pre-ignition and detonation.
• Heat Range 9 for Precision Tuning – A colder heat range designed to prevent overheating in high-horsepower applications, making it perfect for racing, turbocharged, and supercharged setups.
• Trusted Durability & Longevity – Manufactured with premium materials, these NGK plugs ensure reliable performance, improved throttle response, and increased engine longevity in demanding conditions.