“Five times more efficient than the OEM stock wires” Corvette Guys is pleased to announce our New LS series ignition wire set. They are 12mm Hi-Performance wires. A triple layer construction of silicone and extra insulation makes this one of the best wires on the market. Fits all LS series motors from 97 to present Competition Sleeving for GM. Why MULTI-FIRE Spark Plug Wires? High Performance 12mm Spark Plug Wire Fits GM- 5.3/ 5.4 Liter Motor Resistant in wire; 40 OHM Competition Sleeving Will take 20,000 volts of bleed Double Heat Shrink Silicone 600°F. Black- Gray- hi heat Features: - 12 MM PURE SILICONE outer core for the ultimate in heat resistance and durability. - Kevlar inner core for the ultimate in strength and durability combined with true copper wiring. - Stainless Steel terminals. - Black Sleeving. - Can be used with OEM heat shield or without (preferred w/supercharge or turbo charged engine. (Heat shield not included) - Finest ignition wire for the street or strip that is 5 times more efficient than stock OEM wires.