{"title":"Headers for 2021 GMC Sierra 3500 HD","description":"\u003cp\u003eShop 5 headers that fit the 2021 GMC Sierra 3500 HD from Stainless Works and aFe. Every part shows its real ship date and California status, orders over $100 ship free in the lower 48, and you can hear real sound clips before you buy.\u003c\/p\u003e","products":[{"product_id":"afe-twisted-1-3-4in-304ss-shorty-header-20-23-gm-2500-3500hd-6-6l-v8","title":"aFe Twisted 1-3\/4in 304SS Shorty Header 20-23 GM 2500\/3500HD 6.6L V8","description":"\u003cp\u003e1-3\/4\" 304 Stainless Steel Construction: This system is constructed of 1-3\/4\" mandrel-bent 304 stainless steel tubing for maximum strength and durability.  Powerful Sound: This system produces a powerful sound unleashing all available horsepower and torque.  Installation: Utilizing factory style flanges this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation.  Heavy Duty Flanges: Factory style laser cut flanges are used used for a secure leak-free seal.  Optimized Tube Lengths: Tube lengths are optimized for true pulse control technology which improves flow and performance.  Retains Factory Sensors: This system has been designed to retain all your factory sensors for a hassle free installation.  Computer-Aided Design: Utilizing state-of-the-art computer-aided design technology, this system is designed for custom, high tolerance factory fitment.  MIG-Welded: 100% MIG-Welded for race-proven strength and durability.  Emissions Disclaimer: This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.  aFe POWER exhaust systems are engineered and manufactured in our Corona, California facility.\u003c\/p\u003e\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHeavy Duty Laser Cut Flanges are used for a Durable Leak-Free Seal\u003c\/li\u003e\n\u003cli\u003eWorks with Factory Exhaust System with No Modifications Necessary\u003c\/li\u003e\n\u003cli\u003eConstructed from 1-3\/4\" Mandrel-Bent 304 Stainless Steel Tubing\u003c\/li\u003e\n\u003cli\u003eOptimized Tube Lengths for Improve Flow and Performance\u003c\/li\u003e\n\u003cli\u003e100% MIG-Welded for Strength and Durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot legal for sale or use on pollution-controlled vehicles in California.\u003c\/strong\u003e\u003c\/p\u003e","brand":"aFe","offers":[{"title":"Default Title","offer_id":46574939668632,"sku":"AFE48-34145","price":1099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0708\/8567\/1064\/files\/9854b6fd7cc599827694bd9afd4e5daeL.jpg?v=1792284106"},{"product_id":"stainless-works-2020-21-silverado-hd-6-6l-2in-long-tube-header-kit-performance-connect","title":"Stainless Works 2020-21 Silverado HD 6.6L 2in Long Tube Header Kit Performance Connect","description":"\u003cp\u003eUpgrade to Long Tube headers on your 2020-21 Chevy Silverado or GMC Sierra HD with this system from Stainless Works. Unleash that 6.6L motor with 2\" primaries that flow into a 3\" collector with an integrated merge spike. This system comes with high flow cats and an X-pipe for a simple bolt-on install.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot legal for sale or use on pollution-controlled vehicles in California.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Stainless Works","offers":[{"title":"Default Title","offer_id":46579304333464,"sku":"SSWCT220HCAT","price":2612.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0708\/8567\/1064\/files\/6039eb3584e82d77e3cab91d00694b5aL.jpg?v=1792285703"},{"product_id":"stainless-works-2020-21-silverado-hd-6-6l-2in-long-tube-header-kit-factory-connect","title":"Stainless Works 2020-21 Silverado HD 6.6L 2in Long Tube Header Kit Factory Connect","description":"\u003cp\u003eUpgrade to Long Tube headers on your 2020-21 Chevy Silverado or GMC Sierra HD with this system from Stainless Works. Unleash that 6.6L motor with 2\" primaries that flow into a 3\" collector with an integrated merge spike. This system comes with high flow cats and a Y-pipe for a simple bolt-on install.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot legal for sale or use on pollution-controlled vehicles in California.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Stainless Works","offers":[{"title":"Default Title","offer_id":46579304366232,"sku":"SSWCT220HCATY","price":2465.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0708\/8567\/1064\/files\/0be973580646115f3ce1727f70c64d71L_54b04f75-523a-4a81-95af-fdd964514b4a.jpg?v=1792285703"},{"product_id":"stainless-works-2020-21-silverado-hd-6-6l-1-7-8in-long-tube-header-kit-performance-connect","title":"Stainless Works 2020-21 Silverado HD 6.6L 1-7\/8in Long Tube Header Kit Performance Connect","description":"\u003cp\u003eUpgrade to Long Tube headers on your 2020-21 Chevy Silverado or GMC Sierra HD with this system from Stainless Works. Unleash that 6.6L motor with 1-7\/8\" primaries that flow into a 3\" collector with an integrated merge spike. This system comes with high flow cats and an X-pipe for a simple bolt-on install.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot legal for sale or use on pollution-controlled vehicles in California.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Stainless Works","offers":[{"title":"Default Title","offer_id":46579304431768,"sku":"SSWCT220HSTCAT","price":2612.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0708\/8567\/1064\/files\/6039eb3584e82d77e3cab91d00694b5aL_1af6f8ac-d0ba-4152-83ec-5bf8ee1e5212.jpg?v=1792285705"},{"product_id":"stainless-works-2020-21-silverado-hd-6-6l-1-7-8in-long-tube-header-kit-factory-connect","title":"Stainless Works 2020-21 Silverado HD 6.6L 1-7\/8in Long Tube Header Kit Factory Connect","description":"\u003cp\u003eUpgrade to Long Tube headers on your 2020-21 Chevy Silverado or GMC Sierra HD with this system from Stainless Works. 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