Blue Streak ready-to-install, custom-fit 8mm Triple Silicone wire sets can be used with stock coils or when upgrading to a performance coil. These spark plug wire sets meet or exceed all of the factory'srequirements. Plus, our special "XXX" triple silicone wire features; quality construction of silicone throughout the jacket, insulation, ? core, which assures high temperature resistance and high durability. Wire sets also offer maximum RFI suppression and feature high dielectric strength silicone boots, OEM-style terminals that lock onto the spark plug, and much more. Rated at SAE CLASS E J2031 with a continuous operating temperature of 450°F