Introduction An ignition coil/spark coil is an induction coil in an automobile's ignition system that transforms the battery's low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel. The amount of energy in the spark required to ignite the air-fuel mixture varies depending on the pressure & composition of the mixture, & on the speed of the engine. An ignition coil consists of a laminated iron core surrounded by two coils of copper wire. Maxpeedingrods provides ignition coils compatible for Cadillac, compatible for Chevrolet, compatible for GMC & compatible for Buick series. Application 2004compatible for Buick Rainer 5.3L 2002-2004 compatible for Cadillac Escalade 6.0L 1999-2006 compatible for Chevy C, K 1500 compatible for Silverado Gen III LS1 Vortec Trailbazer 4.8L 1999-2006 compatible for Chevy C, K 1500 compatible for Silverado 4.8L 1999-2006 compatible for Chevy SSR 4.8L 1999-2006 compatible for Chevy C, K 1500-2500 compatible for Silverado, Ssr Gen III LS1 Vortec 5.3L 1999-2006 compatible for Chevy Suburban, Tahoe Gen III LS1 Vortec 5.3L 1999-2006 compatible for Chevy C, K 2500 compatible for Silverado Gen III LS1 Vortec 6.0L 1999-2006 compatible for Chevy Suburban, Tahoe Gen III LS1 Vortec 6.0L 1999-2006 compatible for GMC C, K 1500 for Sierra Gen III LS1 Vortec, Envoy 4.8L 1999-2006 compatible for GMC C, K 1500 for Sierra Gen III LS1 Vortec 5.3L1999-2006 compatible for GMC Yukon, Denali Gen III LS1 Vortec 5.3L 1999-2006 compatible for GMC C, K 2500 for Sierra, Yukon Gen III LS1 Vortec 6.0 L Specification 10.5mm Spiral Wound Design This plug wire kit adopt ultralow resistance Kevlar core Direct replacment. No need to modify. Quantity: One set with 8 pieces (as the picture show) Condition: New Warranty: one year warranty for any manufacturing defect Features- Increased Ignition Performance --- High voltage output & spark energy - enhanced Combustion - enhanced throttle response & smoothness - Direct fit for factory mountings - Solid construction - Designed for comfortable use & best quality - Replacement of the original item (safety, accuracy, service life & quality) - High-quality materials for high durability & long service life Notice- No instruction included; Professional installation alignment suggested. - Please check our store for other auto parts you may be interested in. - Please feel free to contact us for whatever we can help.