{"product_id":"catalytic-converter-for-dodge-ram-1500-2004-2005-3-7l-4-7l-left-right","title":"Catalytic Converter for Dodge Ram 1500 (2004-2005) 3.7L 4.7L Left \u0026 Right","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Left \u0026amp; Right Catalytic Converter Set for 2004-2005 Dodge Ram 1500 (DR)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The catalytic converter set replaces deteriorated factory emissions equipment on the 2004-2005 Dodge Ram 1500 to eliminate P0420\/P0430 DTCs, restore exhaust gas velocity, and maintain Federal EPA compliance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Dodge Ram 1500 Substrate Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory catalytic converters on the third-generation \u003cstrong\u003eDR\u003c\/strong\u003e chassis Dodge Ram 1500 are prone to washcoat degradation and substrate sintering over extended duty cycles. On both the \u003cstrong\u003ePowerTech 3.7L V6\u003c\/strong\u003e and \u003cstrong\u003ePowerTech 4.7L V8\u003c\/strong\u003e, sustained operating temperatures and upstream blow-by or rich-condition misfires cause the ceramic honeycomb matrix to clog or break apart. This thermal breakdown creates restrictive exhaust backpressure, elevates EGTs, chokes engine breathing, and triggers recurring catalyst efficiency trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed with durable stainless steel outer bodies, this direct-fit driver and passenger side catalytic converter pair features high-flow ceramic substrates loaded with washcoat formulations engineered to meet Federal EPA standards. The assemblies incorporate factory-profile 2-bolt loose inlet flanges with precision flares and OE-spec slip joints—utilizing a 2.25-inch OD outlet on the left pipe (\u003cstrong\u003e645438\u003c\/strong\u003e) and a 2.50-inch OD outlet on the right pipe (\u003cstrong\u003e645854\u003c\/strong\u003e). Integrated dual O2 sensor bungs per side provide factory sensor positioning to safeguard downstream closed-loop fuel feedback control without throwing false CELs.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Left Catalytic Converter (Part # 645438)\u003c\/li\u003e\n  \u003cli\u003e1 Right Catalytic Converter (Part # 645854)\u003c\/li\u003e\n  \u003cli\u003eOutlet Mounting Hardware\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;\"\u003e2004-2005 Dodge Ram 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;\"\u003ePowerTech 3.7L V6, PowerTech 4.7L V8 \/ DR Chassis\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;\"\u003e215 hp \/ 235 lb-ft (3.7L) | 235 hp \/ 295-300 lb-ft (4.7L)\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;\"\u003e645438, 645854\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\u003e2004-2005 Dodge Ram 1500 3.7L V6\u003c\/li\u003e\n  \u003cli\u003e2004-2005 Dodge Ram 1500 4.7L V8 (Gas and Flex Fuel)\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 DR Ram 1500?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2004-2005 Dodge Ram 1500 equipped with the \u003cstrong\u003ePowerTech 3.7L\u003c\/strong\u003e or \u003cstrong\u003e4.7L\u003c\/strong\u003e engine; it is not legal for sale or use in California, Colorado, New York, or Maine.\u003c\/p\u003e\n\n\u003ch4\u003eShould oxygen sensors be replaced during installation?\u003c\/h4\u003e\n\u003cp\u003eYes, replacing upstream and downstream O2 sensors is strongly recommended alongside rectifying any underlying misfires or trim imbalances to avoid thermal shock to the new ceramic substrate.\u003c\/p\u003e\n\n\u003ch3\u003eThe Dodge Ram Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle severe towing and daily payload duties, this stainless steel direct-fit exhaust hardware maintains critical backpressure balance and exhaust gas scavenging under sustained heavy load conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67592000569592,"sku":"DS-E0WXD6CNB","price":276.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-dodge-ram-1500-2004-2005-3-7l-4-7l-left-right-1.jpg?v=1791396023","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-dodge-ram-1500-2004-2005-3-7l-4-7l-left-right","provider":"Performance Chip Tuning","version":"1.0","type":"link"}