{"product_id":"exhaust-header-for-jeep-wrangler-1991-2002-2-5l","title":"Exhaust Header for Jeep Wrangler (1991-2002) 2.5L","description":"\u003ch2\u003eHigh-Flow Replacement Exhaust Header for 1991-2002 Jeep Wrangler\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Exhaust Header replaces the restrictive, crack-prone factory manifold on the 1991-2002 Jeep Wrangler to reduce exhaust backpressure, accelerate gas velocity, and restore lost engine torque.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jeep Wrangler Manifold Stress Fractures\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust manifold on the \u003cstrong\u003eAMC 150\u003c\/strong\u003e 2.5L inline-four engine is notorious for severe thermal fatigue. Constant thermal cycling between low-speed rock crawling and highway loads induces extreme stress at the runner junctions and collector welds. This causes microscopic fissures that propagate into severe exhaust leaks, causing unmetered oxygen ingress, skewed upstream O2 sensor readings, erratic idle fueling, and distinctive ticking under acceleration.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eFabricated from heavy-gauge mild steel, this direct-fit replacement header incorporates smooth, mandrel-bent primary tubes designed to balance scavenging dynamics across all four cylinders. Precision-machined, thick-gauge mounting flanges resist thermal warpage to eliminate flange-face blowouts against the cylinder head. The integrated collector smoothly funnels exhaust pulses into the downpipe, lowering combustion chamber heat soak and eliminating the structural failure points inherent to the OEM cast and welded log assemblies.\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;\"\u003e1991-2002 Jeep Wrangler\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;\"\u003e\n\u003cstrong\u003eAMC 150 (2.5L I4)\u003c\/strong\u003e \/ \u003cstrong\u003eYJ\u003c\/strong\u003e \u0026amp; \u003cstrong\u003eTJ\u003c\/strong\u003e\n\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;\"\u003e120 hp \/ 139 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\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1991-1995 Jeep Wrangler \u003cstrong\u003eYJ\u003c\/strong\u003e 2.5L 4-Cylinder\u003c\/li\u003e\n  \u003cli\u003e1997-2002 Jeep Wrangler \u003cstrong\u003eTJ\u003c\/strong\u003e 2.5L 4-Cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the YJ and TJ Wrangler?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct bolt-on replacement for both the \u003cstrong\u003eYJ\u003c\/strong\u003e and \u003cstrong\u003eTJ\u003c\/strong\u003e generations equipped with the 2.5L \u003cstrong\u003eAMC 150\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this require custom ECM tuning or cause a Check Engine Light?\u003c\/strong\u003e\u003cbr\u003e No ECM recalibration is necessary, and factory oxygen sensor locations are retained to ensure correct closed-loop air-fuel ratios without throwing diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jeep Trail Durability Standard\u003c\/h3\u003e\n\u003cp\u003eTrail rigs require uncompromising mechanical reliability under heavy load and extreme chassis articulation. This header delivers structural stability designed to withstand trail washboards, off-camber heat loads, and rocky climbs without cracking or blowing exhaust gaskets.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50607150072056,"sku":"DS-EJ4BYSXAD","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-header-for-jeep-wrangler-1991-2002-2-5l-1.jpg?v=1790091015","url":"https:\/\/performancechiptuning.com\/products\/exhaust-header-for-jeep-wrangler-1991-2002-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}