{"product_id":"catalytic-converter-for-gmc-envoy-2002-2005-4-2l","title":"Catalytic Converter for GMC Envoy (2002-2005) 4.2L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Replacement Catalytic Converter for 2002-2005 GMC Envoy (GMT360)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit catalytic converter replaces the deteriorated factory emissions core on the 2002-2005 GMC Envoy to eliminate P0420 diagnostic trouble codes and restore factory exhaust gas scavenging.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Envoy Catalyst Degradation\u003c\/h3\u003e\n\u003cp\u003eThe OEM catalytic converter on the \u003cstrong\u003eGMT360\u003c\/strong\u003e platform suffers from thermal breakdown and precious metal washcoat depletion over extended heat cycles. Operating the naturally aspirated inline-six under sustained loads degrades the internal honeycomb matrix, resulting in catalyst fracturing, substrate sintering, and restricted exhaust flow. When the washcoat fails to facilitate proper reduction and oxidation reactions, downstream O2 sensors register sub-threshold conversion efficiency, triggering persistent P0420\/P0430 DTCs, poor fuel economy, and potential internal backpressure spikes that stifle top-end power.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement converter utilizes a high-flow ceramic honeycomb substrate engineered with an active catalytic washcoat to maximize surface area contact and optimize exhaust gas dwell time. Encased in a heavy-gauge, corrosion-resistant stainless steel body, the assembly withstands road debris and severe thermal shock without shell distortion. The system integrates precision-formed loose inlet flanges, an OEM-style 2-bolt welded outlet flange, and factory-placed oxygen sensor bungs to guarantee a leak-free mechanical seal without custom cutting, pipe expanding, or MIG welding.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Direct-Fit Catalytic Converter\u003c\/li\u003e\n  \u003cli\u003eInstallation Bolts \/ Screws\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: 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;\"\u003e2002-2005 GMC Envoy\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;\"\u003eAtlas LL8 4.2L L6 \/ GMT360\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;\"\u003e275 hp \/ 275 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;\"\u003e55476, 645878, 50365, 19100\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\u003e2002-2005 GMC Envoy (4.2L L6)\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 GMT360 Envoy?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2002-2005 GMC Envoy equipped with the \u003cstrong\u003eAtlas LL8 4.2L\u003c\/strong\u003e inline-six engine. \u003cstrong\u003eNote: This EPA-compliant 48-state converter cannot be sold or shipped to California, Colorado, New York, or Maine.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWill installation require cutting or welding?\u003c\/h4\u003e\n\u003cp\u003eNo, this is a complete direct-fit assembly featuring a loose inlet flange and a 2-bolt welded outlet flange designed to bolt directly to OEM exhaust locations.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Truck Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for the rigorous duty cycles of midsize utility platforms, this exhaust component maintains structural rigidity and optimal backpressure to preserve hauling power and torque under towing conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67901630742776,"sku":"DS-EMPS6MOHX","price":130.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-gmc-envoy-2002-2005-4-2l-1.jpg?v=1793339971","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-gmc-envoy-2002-2005-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}