{"product_id":"catalytic-converter-for-jaguar-xj8-2004-2009-4-2l-left-right","title":"Catalytic Converter for Jaguar XJ8 (2004-2009) 4.2L Left \u0026 Right","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit EPA Catalytic Converter Pair for 2004-2009 Jaguar XJ8 (X350)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit catalytic converter pair replaces degraded factory emissions assemblies on the 2004-2009 Jaguar XJ8 to clear catalytic efficiency error codes, eliminate internal substrate rattle, and restore proper exhaust gas scavenging.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jaguar XJ8 Substrate Degradation\u003c\/h3\u003e\n\u003cp\u003eAs mileage accumulates on the \u003cstrong\u003eX350\u003c\/strong\u003e chassis, sustained thermal cycles and continuous exhaust gas temperatures deteriorate the internal ceramic washcoat inside the factory converters. On the naturally aspirated \u003cstrong\u003eAJ34\u003c\/strong\u003e 4.2L V8, aged cores succumb to chemical poisoning and physical matrix fracturing. This triggers downstream oxygen sensor faults—specifically DTC codes \u003cstrong\u003eP0420\u003c\/strong\u003e and \u003cstrong\u003eP0430\u003c\/strong\u003e—while loose, broken monolith fragments create distinct metallic rattles and generate unwanted exhaust backpressure that hampers high-RPM efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered for a direct bolt-on installation, this left and right catalytic converter set features robust stainless steel tubing and OE-style mating flanges that seal directly to factory mounting locations. Within the corrosion-resistant steel bodies, dense ceramic honeycomb monoliths coated in precious-metal catalysts (platinum, palladium, and rhodium) maximize the conversion of HC, CO, and NOx into compliant emissions. Integrated sensor bungs maintain proper downstream O2 sensor orientation to restore factory air-fuel feedback loops without cutting, bending, or welding.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Left-Side Direct-Fit Catalytic Converter\u003c\/li\u003e\n  \u003cli\u003e1 x Right-Side Direct-Fit Catalytic Converter\u003c\/li\u003e\n  \u003cli\u003eExhaust Flange Gaskets\u003c\/li\u003e\n  \u003cli\u003eMounting 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;\"\u003e2004-2009 Jaguar XJ8\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;\"\u003eAJ-V8 (AJ34 4.2L) \/ X350, X358\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;\"\u003e300 hp \/ 310 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\u003e2004 Jaguar XJ8 4.2L V8 (Left \u0026amp; Right)\u003c\/li\u003e\n  \u003cli\u003e2005 Jaguar XJ8 4.2L V8 (Left \u0026amp; Right)\u003c\/li\u003e\n  \u003cli\u003e2006 Jaguar XJ8 4.2L V8 (Left \u0026amp; Right)\u003c\/li\u003e\n  \u003cli\u003e2007 Jaguar XJ8 4.2L V8 (Left \u0026amp; Right)\u003c\/li\u003e\n  \u003cli\u003e2008 Jaguar XJ8 4.2L V8 (Left \u0026amp; Right)\u003c\/li\u003e\n  \u003cli\u003e2009 Jaguar XJ8 4.2L V8 (Left \u0026amp; Right)\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 X350 XJ8?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2004-2009 Jaguar XJ8 equipped with the \u003cstrong\u003eAJ34\u003c\/strong\u003e 4.2L engine. \u003cstrong\u003eThis 49-state EPA compliant unit is not CARB-approved and cannot be legally installed or registered in California or other CARB-adopting states.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWill this unit clear check engine codes P0420 and P0430?\u003c\/h4\u003e\n\u003cp\u003eAssuming your O2 sensors, exhaust manifold gaskets, and fuel trims are functioning correctly, replacing failed converters with this fresh catalyst matrix restores conversion efficiency to clear P0420 and P0430 fault codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jaguar Precision Standard\u003c\/h3\u003e\n\u003cp\u003ePreserve your European luxury sedan’s factory refinement with hardware engineered for precision acoustic balance, reliable emissions compliance, and permanent elimination of catalyst-related check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67911318044920,"sku":"DS-EJ6Y996ZN","price":256.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-jaguar-xj8-2004-2009-4-2l-left-right-1.jpg?v=1793400299","url":"https:\/\/performancechiptuning.com\/de\/products\/catalytic-converter-for-jaguar-xj8-2004-2009-4-2l-left-right","provider":"Performance Chip Tuning","version":"1.0","type":"link"}