{"product":{"id":11350202155350,"title":"Kooks GM 1500 4.8 \/ 5.3 Header Kit, 1-7\/8-inch (1999-2006) | 2851H420","body_html":"\u003ch2\u003eMake your GM V8 part of the enjoyment\u003c\/h2\u003e\u003cp\u003eUpgrade the front exhaust on your supported GM 1500 truck or SUV with Kooks 1-7\/8\" long tube headers and a Performance-catted Y-pipe. The kit covers the listed 4.8- and 5.3-litre applications and joins the OEM rear exhaust, letting a compatible cat-back stay in place.\u003c\/p\u003e\u003cp\u003eSKU: 2851H420\u003c\/p\u003e\u003ch2\u003eA matched package for your truck\u003c\/h2\u003e\u003cp\u003eThe 304 stainless headers have 3\" collectors feeding the supplied 3\" Y-pipe. Choosing the headers and front connections together gives you a coordinated conversion from the cylinder heads to the retained rear exhaust.\u003c\/p\u003e\u003ch2\u003eChoose around your engine and year\u003c\/h2\u003e\u003cp\u003eThis is the 1-7\/8\" package for the listed 1999-2006 applications. A separate 1-3\/4\" kit is also available. Choose the primary around your engine modifications; the larger size alone is not a promise of a better result on every engine. Performance cats are for naturally aspirated use.\u003c\/p\u003e\u003ch2\u003eFitting your exhaust\u003c\/h2\u003e\u003cp\u003eSome installations with 90-degree spark-plug boots need the wires modified as shown in the fitting guide, or replaced with suitable aftermarket wires.\u003c\/p\u003e\u003ch2\u003eTuning for your exhaust upgrade\u003c\/h2\u003e\u003cp\u003eWe recommend tuning with every header installation so the calibration suits your new headers, complete exhaust and fuel. \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/pages\/contact\"\u003eContact us\u003c\/a\u003e to discuss the right tuning route for your vehicle.\u003c\/p\u003e\u003ch2\u003eVehicle fitment\u003c\/h2\u003e\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"vehicle-fitment\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eYears\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eVehicle \/ trim\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eEngine\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eApplicable SKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eFitting conditions\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2005\u003c\/td\u003e\n\u003ctd\u003eCadillac Escalade Base\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Avalanche 1500 Z71\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Avalanche 1500 Base\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Avalanche 1500 LT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Avalanche 1500 LS\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 LT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 LT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 LS\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 LS\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2005\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 Base\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2005\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 Base\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 WT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500 WT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado 1500\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Suburban 1500 LS\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Suburban 1500 LT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Suburban 1500 Base\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Suburban 1500 Z71\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe LS\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe LS\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe LT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2004\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe LT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe Base\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe Base\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2003-2006\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe Z71\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2003-2004\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe Z71\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 SLE\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 SLT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 SLE\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2004\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 SLT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 SL\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 SL\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 WT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 WT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2005\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 Base\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2005\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 Base\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 HT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002\u003c\/td\u003e\n\u003ctd\u003eGMC Sierra 1500 HT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon SLE\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon SLT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon SLE\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2005\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon SLT\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon SL\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon SL\u003c\/td\u003e\n\u003ctd\u003e4.8L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon XL 1500 SLT\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon XL 1500 SLE\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2006\u003c\/td\u003e\n\u003ctd\u003eGMC Yukon XL 1500 SL\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"technical-specifications\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSpecification\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e2851H420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eListed 1999-2006 GM 1500 trucks and SUVs, 4.8L \/ 5.3L V8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e304 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeaders\u003c\/td\u003e\n\u003ctd\u003e1-7\/8\" primaries; 3\" collectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eY-pipe\u003c\/td\u003e\n\u003ctd\u003e3\" Performance-catted stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear outlet\u003c\/td\u003e\n\u003ctd\u003eOEM interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCatalyst condition\u003c\/td\u003e\n\u003ctd\u003eNaturally aspirated only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpark-plug wire clearance\u003c\/td\u003e\n\u003ctd\u003eSome 90-degree-boot installations require wire modification or suitable replacement wires\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eIs the 1-3\/4-inch version the same SKU?\u003c\/h3\u003e\u003cp\u003eNo. The smaller-primary package is 2851H220.\u003c\/p\u003e\u003ch3\u003eDoes this kit replace the rear mufflers?\u003c\/h3\u003e\u003cp\u003eIt supplies the headers and front Y-pipe, joining the OEM rear exhaust interface.\u003c\/p\u003e\u003ch2\u003eIntended use\u003c\/h2\u003e\u003cp\u003eCompetition, off-road and track use only. Not for use on public roads.\u003c\/p\u003e\u003ch2\u003eOrdering and delivery\u003c\/h2\u003e\u003cp\u003eEstimated lead time is 4-6 weeks. Delivery may be faster depending on stock levels. Shipping is charged separately.\u003c\/p\u003e","vendor":"Kooks","product_type":"Header Kits","created_at":"2026-10-08T10:40:44+01:00","handle":"kooks-2851h420","updated_at":"2026-10-10T19:09:39+01:00","published_at":"2026-10-09T13:46:18+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, dept:performance-parts, fits:cadillac-escalade, fits:chevrolet-avalanche, fits:chevrolet-silverado-1500, fits:chevrolet-suburban, fits:chevrolet-tahoe, fits:gmc-sierra-1500, fits:gmc-yukon, fits:gmc-yukon-xl, make:cadillac, make:chevrolet, make:gmc, type:header-kit","variants":[{"id":55646887149910,"product_id":11350202155350,"title":"Default Title","price":"3465.20","sku":"2851H420","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-10-08T10:40:44+01:00","updated_at":"2026-10-10T19:09:39+01:00","taxable":true,"barcode":"842422178376","grams":23587,"image_id":null,"weight":23.587,"weight_unit":"kg","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"GBP","compare_at_price_currency":"","quantity_price_breaks":[]}],"options":[{"id":14512382017878,"product_id":11350202155350,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":86449165173078,"product_id":11350202155350,"position":1,"created_at":"2026-10-08T10:40:44+01:00","updated_at":"2026-10-08T10:40:48+01:00","alt":"Kooks 1-7\/8\" Header and Catted Connection Kit. 1999-2006 GM 1500 Series 4.8L\/5.3L.","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/73dc1e0ef0acd40f54f5cac694a74599_905743ad-ecbd-485d-b01a-e22e4f183afa.jpg?v=1791452448","variant_ids":[]},{"id":86449165205846,"product_id":11350202155350,"position":2,"created_at":"2026-10-08T10:40:44+01:00","updated_at":"2026-10-08T10:40:48+01:00","alt":"Kooks 1-7\/8\" Header and Catted Connection Kit. 1999-2006 GM 1500 Series 4.8L\/5.3L.","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/ef99892f866d95595951e5c73d4f22ef_22e8f903-e645-4ab0-994f-de73986aeef8.jpg?v=1791452448","variant_ids":[]}],"image":{"id":86449165173078,"product_id":11350202155350,"position":1,"created_at":"2026-10-08T10:40:44+01:00","updated_at":"2026-10-08T10:40:48+01:00","alt":"Kooks 1-7\/8\" Header and Catted Connection Kit. 1999-2006 GM 1500 Series 4.8L\/5.3L.","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/73dc1e0ef0acd40f54f5cac694a74599_905743ad-ecbd-485d-b01a-e22e4f183afa.jpg?v=1791452448","variant_ids":[]}}}