The kit includes 8 replacement Energy ignition coils for installation in the UF271. 2003-2005 Chevrolet Express 2500 4.8L V8 2004 Chevrolet Express 3500 4.8L V8 2003-2005 GMC Savana 2500 4.8L V8 2003-2005 GMC Savana 3500 4.8L V8 1999-2006 GMC Sierra 1500 Chevrolet Avalanche 1500 5.3L V8 2003-2004 GMC Envoy XL 5.3L V8 2004 GMC Envoy XUV 5.3L V8 2002-2005 Cadillac Escalade 5.3L V8 2003-2006 Chevrolet Express 1500 5.3L V8 2003-2005 Chevrolet Express 2500 5.3L V8 2006 Chevrolet Monte Carlo 5.3L V8 2003-2005 GMC Savana 1500 5.3L V8 2003-2005 GMC Savana 2500 5.3L V8 1999-2006 GMC Sierra 1500 5.3L V8 2000 GMC Sierra 2500 5.3L V8 1999-2006 Chevrolet Silverado 1500 5.3L V8 2007 Chevrolet Silverado 1500 Classic 5.3L V8 1999-2000 Chevrolet Silverado 2500 5.3L V8 2003-2004 Chevrolet SSR 5.3L V8 2000-2006 Chevrolet Suburban 1500 5.3L V8 2000-2006 Chevrolet Tahoe 5.3L V8 2003-2004 Chevrolet Trailblazer EXT 5.3L V8 2000-2006 GMC Yukon 5.3L V8 2000-2006 GMC Yukon XL 1500 5.3L V8 2002-2006 Cadillac Escalade 6.0L V8 2003-2006 Cadillac Escalade ESV 6.0L V8 2002-2006 Cadillac Escalade EXT 6.0L V8 2003-2005 Chevrolet Express 2500 6.0L V8 2003-2004 Chevrolet Express 3500 6.0L V8 2003-2007 Hummer H2 6.0L V8 2005 Isuzu NPR 6.0L V8 2003 GMC Savana 2500 6.0L V8 2003-2005 GMC Savana 3500 6.0L V8 2001-2006 GMC Sierra 1500 6.0L V8 2007 GMC Sierra 1500 Classic 6.0L V8 2001-2005 GMC Sierra 1500 HD 6.0L V8 1999-2004 GMC Sierra 2500 6.0L V8 2001-2007 GMC Sierra 2500 HD 6.0L V8 2002-2006 GMC Sierra 3500 6.0L V8 2007 GMC Sierra 3500 HD 6.0L V8 2003-2006 Chevrolet Silverado 1500 6.0L V8 2007 Chevrolet Silverado 1500 Classic 6.0L V8 2001-2005 Chevrolet Silverado 1500 HD 6.0L V8 2007 Chevrolet Silverado 1500 HD Classic 6.0L V8 1999-2004 Chevrolet Silverado 2500 6.0L V8 2001-2007 Chevrolet Silverado 2500 HD 6.0L V8 2002-2006 Chevrolet Silverado 3500 6.0L V8 2007 Chevrolet Silverado 3500 Classic 6.0L V8 2007 Chevrolet Silverado 3500 HD 6.0L V8 2002 Chevrolet Suburban 2500 6.0L V8 2001-2006 GMC Yukon 6.0L V8 2002-2006 GMC Yukon XL 1500 6.0L V8 2000-2004 GMC Yukon XL 2500 6.0L V8 2003-2008 Chevrolet C4500 Kodiak 6.6L V8 2003-2006 GMC C4500 Topkick 6.6L V8 2005-2008 GMC C5500 Topkick 6.6L V8 2007 GMC Sierra 3500 Classic 6.6L V8 2003 Chevrolet Avalanche 2500 8.1L V8 2003-2005 Chevrolet C4500 Kodiak 8.1L V8 2003 GMC C4500 Topkick 8.1L V8 2006-2009 Chevrolet C5500 Kodiak 8.1L V8 2003-2005 GMC C5500 Topkick 8.1L V8 2001 Chevrolet C7500 Kodiak 8.1L V8 2003 Chevrolet Silverado 2500 HD 8.1L V8 2003-2006 Chevrolet Silverado 3500 8.1L V8 2005 Workhorse W22 8.1L V8