1. The Extreme 9000 ceramic spark plug boot has 135 degree ceramic boots withstand up to 2,000° Fahrenheit. Heatresistant materials and construction techniques are employed to ensure the wires can handle the extreme conditions without degrading or causing electrical issues. They contribute to smoother operation, better throttle response, increased power output, and overall enhanced engine efficiency. 2. Premium Performance500 Ohms/foot ferro sprial core the highest level of RFI/EMI suppression. It helps minimize energy loss and minimize the electrical current reaching the spark plugs. This helps improve ignition efficiency and spark performance. Stainless Steel Plug Terminals and 8mm double silicone construction black wire rated at 600° F rated silicone jacket withstand the demanding conditions of the engine bay, including high temperatures, vibration, and exposure to oil and other contaminants. They provide longlasting performance and durability. 3. Fits the Following Vehicles Cadillac, Chevy GMC Vehicles Fits for Cadillac 2006 2007 CTS, 2007 2008 Escalade ESV EXT, Chevy 2007 2008 Avalanche, 2005 2008 Corvette, 2008 Express 1500 2500 3500, 2006 2008 Impala, 2006 2007 Monte Carlo, 2007 2008 Silverado 1500 2500HD 3500HD, 2005 2006 SSR, 2007 2008 Suburban 1500 2500 Tahoe, 2006 2008 Trailblazer EXT, GMC 2005 2008 Envoy XL, 2008 Savana 1500 2500 3500, 2007 2008 Sierra 1500 2500HD 3500HD, 2007 2008 Yukon XL 1500 XL 2500 and more please check the description. 4. Replaces Part Number Accel spark plug wires 9070C this custom fit extreme heat ceramic boot ferrospiral core spark plug wire set fits GM gen 4 LS3/LS4/LS7 engines. This simplifies the replacement process and ensures proper connections, saving time and effort.