Sumax S40231 Pro Race 409 Spark Plug Wires 10.4mm Red for Harley Softail

The Sumax S40231 Pro Race 409 spark plug wires deliver enhanced performance and distinctive style for 2000-2017 Harley-Davidson Softail and 1999-2017 Dyna motorcycles. These premium 10.4mm plug wires feature the same high-performance Spiro-Pro core as Sumax's 8mm wires but with a fat 10.4mm insulator cover for an aggressive, race-inspired appearance.

Key Features:

• 10.4mm diameter for bold, fat wire look
• Spiro-Pro core provides up to 10 times the conductivity of standard carbon-core wires
• 100% silicone construction with extra-high-temperature protection up to 600°F
• Low resistance design runs cooler and lasts 3-4 times longer than carbon-core wires
• Precut to exact length with 90-degree plug boots and 180-degree coil boots pre-installed
• Vibrant red color for custom styling
• Compatible with electronic and points ignitions
• Includes 19-inch and 7-inch leads

These ready-to-install plug wire sets arrive with terminals and boots already attached, making installation quick and straightforward. The silicone jacketed construction maintains flexibility and color vibrancy throughout the life of your motorcycle while delivering maximum spark energy for improved horsepower and throttle response.