{"product_id":"catalytic-converter-for-jeep-grand-cherokee-2001-2004-4-0l-front","title":"Catalytic Converter for Jeep Grand Cherokee (2001-2004) 4.0L Front","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Front Catalytic Converter for 2001-2004 Jeep Grand Cherokee (WJ)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The front catalytic converter replaces deteriorated factory exhaust pre-converters on the 2001-2004 Jeep Grand Cherokee to eliminate P0420\/P0430 diagnostic trouble codes, restore exhaust scavenging, and maintain legal EPA tailpipe emissions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jeep Grand Cherokee Exhaust Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust downpipe assemblies on the \u003cstrong\u003eWJ\u003c\/strong\u003e generation suffer from severe thermal cycling fatigue and internal ceramic washcoat sintering over extended mileage. In the \u003cstrong\u003e4.0L PowerTech\u003c\/strong\u003e inline-six, exhaust pulses and unburned hydrocarbons gradually foul the factory dual pre-catalyst bricks, leading to reduced cross-sectional flow area, elevated exhaust backpressure, and upstream heat retention at the cylinder head exhaust ports. Furthermore, aged factory flanges and thin-gauge pipe sections commonly develop micro-fissures adjacent to the oxygen sensor bungs, causing false lean readings and persistent check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed from heavy-gauge, corrosion-resistant stainless steel, this front catalytic assembly delivers precise flow characteristics without requiring cutting or custom torch work. The unit houses a high-efficiency ceramic substrate loaded with precious metals optimized to clean unburned hydrocarbons and carbon monoxide while minimizing backpressure. CNC-machined, thick-wall connection flanges prevent thermal warping, and precision-located, TIG-welded O2 sensor bungs allow factory downstream sensors to thread in without harness tension. The mandrel-bent downpipe routing maintains laminar exhaust velocity, restoring proper low-end torque dynamics across the entire rev range.\u003c\/p\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;\"\u003e2001-2004 Jeep Grand Cherokee\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;\"\u003e4.0L PowerTech I6 \/ WJ\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;\"\u003e195 hp \/ 230 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;\"\u003e641177, 18H42-606, 10164\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\u003e2001 Jeep Grand Cherokee 4.0L Inline-6 (WJ Chassis) - Front\u003c\/li\u003e\n  \u003cli\u003e2002 Jeep Grand Cherokee 4.0L Inline-6 (WJ Chassis) - Front\u003c\/li\u003e\n  \u003cli\u003e2003 Jeep Grand Cherokee 4.0L Inline-6 (WJ Chassis) - Front\u003c\/li\u003e\n  \u003cli\u003e2004 Jeep Grand Cherokee 4.0L Inline-6 (WJ Chassis) - Front\u003c\/li\u003e\n  \u003cli\u003eNote: Fits 4.0L I6 only; does not fit 4.7L V8 applications. EPA compliant (46-state legal; not legal for sale\/use in CA, NY, CO, or ME).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the WJ Grand Cherokee?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2001-2004 Jeep Grand Cherokee equipped with the \u003cstrong\u003e4.0L PowerTech\u003c\/strong\u003e inline-six engine.\u003c\/p\u003e\n\n\u003ch4\u003eWill this direct-fit converter resolve catalytic efficiency trouble codes like P0420?\u003c\/h4\u003e\n\u003cp\u003eYes, providing upstream air-fuel ratios and sensors are operating within factory spec, the new ceramic catalyst restores conversion efficiency to clear P0420 and P0430 codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jeep Off-Road Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle harsh underbody vibration, frame flex, and severe trail washboard, this stainless steel assembly delivers the rugged mechanical durability and steady low-rpm torque essential for dependable off-road crawling and towing.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67538066047224,"sku":"DS-E5U6XZ0M3","price":202.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-jeep-grand-cherokee-2001-2004-4-0l-front-1.jpg?v=1790621803","url":"https:\/\/performancechiptuning.com\/products\/catalytic-converter-for-jeep-grand-cherokee-2001-2004-4-0l-front","provider":"Performance Chip Tuning","version":"1.0","type":"link"}