{"product_id":"exhaust-kit-for-gmc-sierra-2016-2018-4-3l-5-3l-6-2l","title":"Exhaust Kit for GMC Sierra (2016-2018) 4.3L 5.3L 6.2L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Flow Dual Muffler-Back Exhaust Kit for 2016-2018 GMC Sierra (K2XX)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The dual muffler-back exhaust kit replaces the restrictive factory muffler and single tailpipe on the 2016-2018 GMC Sierra to reduce exhaust gas backpressure, improve scavenging, and optimize acoustic flow.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Sierra Exhaust Restriction and Acoustic Dampening\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust assemblies on the \u003cstrong\u003eK2XX\u003c\/strong\u003e platform utilize oversized, baffled single-inlet mufflers designed strictly for sound attenuation rather than flow efficiency. These internal chambers restrict exhaust velocity, trap excessive heat forward of the rear axle, and suppress exhaust scavenging on high-displacement platforms. Furthermore, the OEM single exit limits volume and throttle response under heavy engine loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis kit upgrades the exhaust architecture utilizing a Flowsound 2-chamber muffler with a 3.00-inch inlet splitting into dual 2.50-inch outlets. Paired with 2.5-inch mandrel-bent aluminized steel tailpipes, the continuous-radius bends eliminate internal crimping to maintain uniform gas velocity and structural integrity. Routed parallel to the frame rails, the geometry retains vital clearance around the factory spare tire and OEM receiver hitch while surviving high duty-cycle thermal expansion.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Flowsound 2-chamber muffler (single 3-inch inlet, dual 2.5-inch outlets)\u003c\/li\u003e\n  \u003cli\u003e2 Aluminized mandrel-bent two-piece 2.5-inch tailpipes (slip-fit configuration)\u003c\/li\u003e\n  \u003cli\u003e8 Muffler clamps\u003c\/li\u003e\n  \u003cli\u003e1 Heavy-duty exhaust clamp\u003c\/li\u003e\n  \u003cli\u003e4 Rubber-insulated mounting hangers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100 style=\" border-collapse: collapse border: solid font-size: min-width:\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2016-2018 GMC Sierra 1500\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e4.3L LV3, 5.3L L83, 6.2L L86 EcoTec3 \/ K2XX\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e285–420 hp \/ 305–460 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2016-2018 GMC Sierra 1500 4.3L V6 EcoTec3 (LV3) Gasoline\/Flex-Fuel\u003c\/li\u003e\n  \u003cli\u003e2016-2018 GMC Sierra 1500 5.3L V8 EcoTec3 (L83) Gasoline\/Flex-Fuel\u003c\/li\u003e\n  \u003cli\u003e2016-2018 GMC Sierra 1500 6.2L V8 EcoTec3 (L86) Gasoline\u003c\/li\u003e\n  \u003cli\u003eFits all standard wheelbases with factory single-inlet muffler configurations only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the K2XX Sierra?\u003c\/h4\u003e\n\u003cp\u003eYes, this system fits 2016-2018 GMC Sierra trucks equipped with the \u003cstrong\u003eLV3\u003c\/strong\u003e, \u003cstrong\u003eL83\u003c\/strong\u003e, or \u003cstrong\u003eL86\u003c\/strong\u003e engines; it is not compatible with dual-inlet factory mufflers, diesel variants, or 2500HD\/3500HD chassis.\u003c\/p\u003e\n\n\u003ch4\u003eIs this exhaust system a direct bolt-on installation?\u003c\/h4\u003e\n\u003cp\u003eNo, this is a custom-fit builder kit requiring an experienced installer to measure, cut, or adapt pipe sections forward of the muffler depending on cab length and wheelbase.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Sierra Towing Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle severe towing cycles and heavy payloads, this aluminized steel setup provides the durability and heat resistance required for heavy working conditions without compromising critical frame or suspension clearances.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67562640277752,"sku":"DS-E261SQPEG","price":229.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-kit-for-gmc-sierra-2016-2018-4-3l-5-3l-6-2l-1.jpg?v=1790988445","url":"https:\/\/performancechiptuning.com\/fr\/products\/exhaust-kit-for-gmc-sierra-2016-2018-4-3l-5-3l-6-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}