{"product_id":"catalytic-converter-for-ford-thunderbird-2003-2005-3-9l","title":"Catalytic Converter for Ford Thunderbird (2003-2005) 3.9L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Replacement Catalytic Converter for 2003-2005 Ford Thunderbird (DEW98)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit catalytic converter replaces degraded factory emissions equipment on the 2003-2005 Thunderbird to resolve P0420\/P0430 diagnostic trouble codes and restore unrestricted exhaust flow.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Ford Thunderbird Catalyst Breakdown\u003c\/h3\u003e\n\u003cp\u003eOver tens of thousands of thermal cycles, the factory converter cores on the \u003cstrong\u003eDEW98\u003c\/strong\u003e platform suffer from washcoat deterioration and substrate sintering. The Jaguar-derived \u003cstrong\u003eAJ35\u003c\/strong\u003e 3.9L V8 runs tight air-fuel tolerances; unburned hydrocarbons or oil vapor blow-by coat the OEM ceramic honeycomb, causing catalytic inactivity, foul sulfur exhaust odors, and elevated exhaust backpressure. This breakdown degrades low-end torque output, limits high-RPM volumetric efficiency, and triggers persistent P0420\/P0430 downstream oxygen sensor faults.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement converter utilizes an upgraded high-grade stainless steel shell that resists external road salt corrosion and severe thermal cycling. Inside, a durable ceramic monolith substrate features an active precious-metal washcoat to reliably scrub unburned hydrocarbons, carbon monoxide, and NOx from the exhaust stream. Built with heavy-gauge, factory-indexed mounting flanges and precision pre- and post-catalyst O2 sensor bungs, it provides a leak-free mechanical seal directly to the factory intermediate exhaust pipes without any cutting, pipe-expanding, or custom fabrication.\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\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: 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;\"\u003e2003-2005 Ford Thunderbird\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;\"\u003e3.9L AJ35 V8 \/ DEW98\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;\"\u003e280 hp \/ 286 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;\"\u003e30531\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\u003e2003 Ford Thunderbird Base 3.9L V8\u003c\/li\u003e\n  \u003cli\u003e2004 Ford Thunderbird Base \/ Pacific Coast Roadster 3.9L V8\u003c\/li\u003e\n  \u003cli\u003e2005 Ford Thunderbird Base \/ 50th Anniversary Edition 3.9L V8\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 DEW98 Thunderbird?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2005 Ford Thunderbird equipped with the \u003cstrong\u003eAJ35\u003c\/strong\u003e engine. \u003cstrong\u003eThis 48-state EPA-compliant converter cannot be sold or shipped to California, Colorado, New York, or Maine.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eIs welding or cutting required during installation?\u003c\/h4\u003e\n\u003cp\u003eNo, this unit features direct-fit, bolt-on OEM-style flanges and integrated pre- and post-catalyst sensor ports designed to bolt directly into the stock exhaust layout.\u003c\/p\u003e\n\n\u003ch3\u003eThe Ford Caliber Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to preserve the smooth exhaust scavenging and quiet cruise dynamics of the rear-wheel-drive \u003cstrong\u003eDEW98\u003c\/strong\u003e chassis, this unit restores OEM emissions compliance while eliminating restrictive exhaust backpressure.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67901863887096,"sku":"DS-EI1NEPC6I","price":207.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-ford-thunderbird-2003-2005-3-9l-1.jpg?v=1793341611","url":"https:\/\/performancechiptuning.com\/fr\/products\/catalytic-converter-for-ford-thunderbird-2003-2005-3-9l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}