{"product_id":"catalytic-converter-for-gmc-sierra-2014-2018-4-3l-5-3l","title":"Catalytic Converter for GMC Sierra (2014-2018) 4.3L 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Stainless Catalytic Converter Pair for 2014-2018 GMC Sierra (K2XX)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This direct-fit catalytic converter pair replaces both factory exhaust banks on the 2014-2018 GMC Sierra 1500 (\u003cstrong\u003eK2XX\u003c\/strong\u003e) equipped with the \u003cstrong\u003eLV3 4.3L V6\u003c\/strong\u003e or \u003cstrong\u003eL83 5.3L V8\u003c\/strong\u003e to restore emissions compliance and exhaust flow.\u003c\/p\u003e\u003ch3\u003eThe Stock GMC Sierra Catalytic Converter Failure\u003c\/h3\u003e\u003cp\u003eFactory catalytic converters on the \u003cstrong\u003eK2XX\u003c\/strong\u003e Sierra 1500 endure extreme thermal cycling under towing and heavy-load operation with the \u003cstrong\u003eLV3 4.3L V6\u003c\/strong\u003e and \u003cstrong\u003eL83 5.3L V8\u003c\/strong\u003e engines. Over time, repeated heat soak and minor fuel trim imbalances fracture the internal ceramic brick and degrade the precious-metal washcoat. Once the substrate breaks loose inside the shell, it restricts exhaust scavenging, triggers catalyst-efficiency faults like \u003cstrong\u003eP0420\u003c\/strong\u003e and \u003cstrong\u003eP0430\u003c\/strong\u003e, and creates an audible metallic rattle under deceleration.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM Catalytic Converter\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \/ Catalyst DTCs:\u003c\/strong\u003e Stored \u003cstrong\u003eP0420\u003c\/strong\u003e (Bank 1) or \u003cstrong\u003eP0430\u003c\/strong\u003e (Bank 2) codes caused by depleted oxygen storage capacity across the catalyst bed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetallic Exhaust Rattle:\u003c\/strong\u003e Audible rattling beneath the cab at idle or low RPM due to a fractured ceramic substrate vibrating inside the converter housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSluggish Acceleration \u0026amp; Failed Emissions:\u003c\/strong\u003e Elevated exhaust backpressure choking top-end power and high HC, CO, and NOx tailpipe readings during federal OBD-II inspection.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Stainless Exhaust Solution\u003c\/h3\u003e\u003cp\u003eThis complete left-bank Y-pipe and right-bank converter assembly restores factory exhaust flow across both cylinder banks simultaneously. Built with corrosion-resistant \u003cstrong\u003estainless steel\u003c\/strong\u003e tubing and an \u003cstrong\u003e8-inch by 5-inch\u003c\/strong\u003e converter body, each pipe resists thermal cracking and road-salt oxidation. Inside, a high-flow \u003cstrong\u003eceramic honeycomb substrate\u003c\/strong\u003e coated in precious-metal washcoat maintains proper light-off temperatures for HC, CO, and NOx conversion. Factory-style manifold flanges, integrated \u003cstrong\u003eO2 sensor ports\u003c\/strong\u003e, and exact-match pipe bends bolt directly into the OEM exhaust system without cutting or welding.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x Left Y-Pipe Catalytic Converter Assembly\u003c\/li\u003e\n\u003cli\u003e1 x Right Catalytic Converter Pipe\u003c\/li\u003e\n\u003cli\u003e1 x U-Clamp\u003c\/li\u003e\n\u003cli\u003e6 x Bolts with Nuts and Washers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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;\"\u003e2014-2018 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;\"\u003eLV3 4.3L V6, L83 5.3L V8 \/ 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;\"\u003eEmissions \u0026amp; Substrate\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eEPA Federal (46-State Legal) \/ Ceramic Honeycomb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Welding)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2014-2018 GMC Sierra 1500 Base (4.3L V6)\u003c\/li\u003e\n\u003cli\u003e2014-2018 GMC Sierra 1500 SLE (4.3L V6)\u003c\/li\u003e\n\u003cli\u003e2014-2018 GMC Sierra 1500 Base (5.3L V8)\u003c\/li\u003e\n\u003cli\u003e2014-2018 GMC Sierra 1500 SLE (5.3L V8)\u003c\/li\u003e\n\u003cli\u003e2014-2018 GMC Sierra 1500 SLT (5.3L V8)\u003c\/li\u003e\n\u003cli\u003e2014-2018 GMC Sierra 1500 Denali (5.3L V8)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExclusions:\u003c\/strong\u003e Not compatible with 6.0L or 6.2L engines, 2019 and newer models, or vehicles registered in CA, NY, CO, or ME.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the K2XX Sierra?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2014-2018 GMC Sierra 1500 equipped with the \u003cstrong\u003eLV3 4.3L V6\u003c\/strong\u003e or \u003cstrong\u003eL83 5.3L V8\u003c\/strong\u003e engine. \u003cstrong\u003eIt does not fit 6.0L or 6.2L engines, 2019 and newer trucks, and is not CARB approved for vehicles registered in California, New York, Colorado, or Maine.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0420\/P0430 codes, and are O2 sensors included?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, it resolves catalyst-efficiency codes caused by a failed converter, though O2 sensors are not included.\u003c\/strong\u003e Transfer your existing sensors or install new ones into the integrated ports, and always inspect upstream exhaust joints for leaks that can falsely trigger \u003cstrong\u003eP0420\u003c\/strong\u003e or \u003cstrong\u003eP0430\u003c\/strong\u003e.\u003c\/p\u003e\u003ch4\u003eWhat hardware is included, and what prep is needed for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eA U-clamp and six bolts with nuts and washers are included for mounting.\u003c\/strong\u003e Allow the exhaust to cool completely, soak seized manifold fasteners with penetrating oil, install using new gaskets, and torque all flange hardware evenly before checking every joint for leaks.\u003c\/p\u003e\u003ch3\u003eThe GMC Heavy-Duty Standard\u003c\/h3\u003e\u003cp\u003eBuilt to withstand the sustained exhaust gas temperatures of towing, hauling, and daily work duties on the \u003cstrong\u003eK2XX\u003c\/strong\u003e platform without substrate breakdown. Replacing both banks simultaneously ensures balanced exhaust backpressure and reliable long-term thermal durability.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68085541765368,"sku":"DS-EVX0RXNKI","price":256.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-gmc-sierra-2014-2018-4-3l-5-3l-1.jpg?v=1794546705","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-gmc-sierra-2014-2018-4-3l-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}