Ford Performance 9mm Red Spark Plug Wire Set for 5.0/5.8L V-8 Engines M-12259-R301

A quality spark plug wire set is fundamental to reliable ignition and engine efficiency—subpar wiring leads to misfires, poor throttle response, and wasted horsepower. The Ford Performance 9mm Red Spark Plug Wire Set delivers proven spark delivery with a spiral core design that minimizes resistance, ensuring consistent combustion across all eight cylinders. If you're running a 5.0 or 5.8L V-8, particularly in a classic Mustang, this is the direct-fit solution that combines OEM-grade durability with the reliability your engine demands.

The spiral core construction is engineered to reduce spark loss during the ignition cycle, translating directly to sharper throttle response and improved low-end torque. Silicone insulation and boots handle sustained heat cycles and resist fuel, oil, and solvent degradation—critical for long-term reliability in high-performance applications. Pre-numbered wires eliminate guesswork during installation, while the included coil wire and HEI-style terminals ensure drop-in compatibility with your existing ignition system. The red finish adds visual appeal without compromising function—form follows performance.

• 9mm wire diameter
• 45-degree boot angle
• HEI-style terminals
• Silicone insulation & boots
• Spiral core design
• Low spark loss resistance
• Pre-numbered cylinders
• Includes coil wire
• Socket-type coil compatible
• 5.0/5.8L V-8 engines
• 1979–1995 Mustang models
• Ford Racing identification
• Heat & chemical resistant
• Bolt-on installation