Spark Plug Wire Set - Extreme 9000 Ceramic Boot - LS Terminals LS3/LS4/LS7 BlackACCEL Extreme 9000 Ceramic Boot Wires feature ultra high temperature, double silicone, 8mm, 500 ohms ft Ferro Spiral core wire developed for performance use. The wire is rated at 600 degrees Fahrenheit peak and the black Ceramic boots withstand up to 2,000 degrees. Great for running headers with close tolerances, an engine bay with little room or an application with high under hood temps. ACCEL Extreme 9000 wires offer excellent energy delivery to the