{"product_id":"exhaust-header-for-ford-expedition-1997-2002-4-6l","title":"Exhaust Header for Ford Expedition (1997-2002) 4.6L","description":"\u003ch2\u003eHigh-Flow Stainless Exhaust Headers for 1997-2002 Ford Expedition\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The high-flow exhaust header kit replaces the crack-prone factory cast-iron exhaust manifolds on the 1997-2002 Expedition to optimize exhaust gas scavenging, reduce backpressure, and eliminate recurring exhaust leaks.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Ford Expedition Manifold Failure\u003c\/h3\u003e\n\u003cp\u003eThe OEM log-style cast-iron manifolds on the \u003cstrong\u003eUN93\u003c\/strong\u003e platform housing the \u003cstrong\u003eModular 4.6L 2V Triton\u003c\/strong\u003e engine suffer from severe heat retention and uneven thermal expansion. Over heavy-duty towing cycles, thermal shock warps the factory casting, repeatedly shearing off the rear exhaust studs on the aluminum cylinder heads and blowing out manifold gaskets. Additionally, the restrictive 90-degree log entries induce exhaust gas reversion, spiking backpressure and choking volumetric efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed from mandrel-bent \u003cstrong\u003eT-304 stainless steel\u003c\/strong\u003e, this shorty header system replaces restrictive log geometry with tuned, free-flowing primary runners that accelerate exhaust pulse velocity. Thick, surface-ground flanges maintain uniform clamping force across cylinder exhaust ports to prevent warped flanges and broken studs. Precision TIG welds resist fatigue under heavy engine vibration, significantly lowering backpressure and improving mid-range torque delivery under load.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e1997-2002 Ford Expedition\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;\"\u003eModular 4.6L V8 \/ UN93\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;\"\u003e215–232 hp \/ 290–291 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 (Direct Replacement Shorty Header)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1997-2002 Ford Expedition XLT 4.6L V8 (UN93)\u003c\/li\u003e\n  \u003cli\u003e1997-2002 Ford Expedition Eddie Bauer 4.6L V8 (UN93)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the UN93 Expedition?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1997-2002 Ford Expedition equipped with the \u003cstrong\u003eModular 4.6L V8\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these shorty headers require an ECU tune or modifications to downstream oxygen sensors?\u003c\/strong\u003e\u003cbr\u003e No, these headers bolt directly to OEM catalytic converter downpipes and retain factory sensor placement without triggering a check engine light.\u003c\/p\u003e\n\n\u003ch3\u003eThe Ford Towing Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle the high thermal loads of continuous hauling and steep grades, upgrading to heavy-gauge stainless steel prevents recurring manifold failures while restoring the engine's intended torque band.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50512352018680,"sku":"DS-EHLP808NT","price":177.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-header-for-ford-expedition-1997-2002-4-6l-1.jpg?v=1789426012","url":"https:\/\/performancechiptuning.com\/products\/exhaust-header-for-ford-expedition-1997-2002-4-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}