These are the absolute Best Spark Plug Wires your money can buy! All wires fire intermittently no matter what coil or ignition you may have. That is why you see carbon on your plugs. ThunderVolts have a solid stream of firepower, resulting in better spark energy, and a cleaner burn. Your bike will start and run better than ever before! They are compatible with all ’08-newer Victory ignition systems, excluding Octane Models.