{"product_id":"catalytic-converter-for-hummer-h3-2007-2008-3-7l-front","title":"Catalytic Converter for Hummer H3 (2007-2008) 3.7L Front","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Front Catalytic Converter for 2007-2008 Hummer H3 (GMT345)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The front catalytic converter replaces the clogged or fractured factory manifold converter on 2007-2008 H3 models to restore exhaust velocity, eliminate catalyst efficiency trouble codes, and ensure legal emissions compliance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Hummer H3 Manifold Catalyst Thermal Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory close-coupled manifold converters on the \u003cstrong\u003eGMT345\u003c\/strong\u003e chassis endure extreme heat soak directly off the exhaust ports. Over time, the aggressive thermal cycling of the \u003cstrong\u003eAtlas LLR\u003c\/strong\u003e engine causes internal washcoat sintering, micro-cracking of the brittle factory ceramic substrate, and structural flange warpage. This degradation leads to restricted exhaust gas scavenge, sluggish engine response, exhaust leaks, and persistent P0420 diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as an exact bolt-on replacement, this front catalytic assembly utilizes high-grade stainless steel tubing to resist high exhaust gas temperatures and external corrosion. Inside, a durable ceramic honeycomb substrate loaded with active noble metal catalysts ensures efficient oxidation of hydrocarbons and carbon monoxide into non-toxic tailpipe emissions. Mandrel-formed collector branches and precision-machined, thick OE-spec flanges ensure a leak-free seal without warping. Integrated factory-positioned O2 sensor ports allow seamless reinstallation of the pre- and post-catalyst oxygen sensors without wiring modification.\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: 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;\"\u003e2007-2008 Hummer H3\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;\"\u003e3.7L LLR Inline-5 \/ GMT345\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;\"\u003e242 hp \/ 242 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;\"\u003e16578, 641338, 19282\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\u003e2007 Hummer H3 Base 3.7L L5 - Front Position\u003c\/li\u003e\n  \u003cli\u003e2007 Hummer H3 X 3.7L L5 - Front Position\u003c\/li\u003e\n  \u003cli\u003e2008 Hummer H3 Base 3.7L L5 - Front Position\u003c\/li\u003e\n  \u003cli\u003e2008 Hummer H3 X 3.7L L5 - Front Position\u003c\/li\u003e\n  \u003cli\u003e2008 Hummer H3 Alpha (Check fitment: Fits 3.7L L5 models only)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT345 H3?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2007-2008 Hummer H3 equipped with the 3.7L LLR inline-5 engine.\u003c\/p\u003e\n\n\u003ch4\u003eIs this catalytic converter legal in all 50 states?\u003c\/h4\u003e\n\u003cp\u003eThis unit is EPA compliant for 46 states and cannot legally be installed or shipped to California, New York, Colorado, or Maine.\u003c\/p\u003e\n\n\u003ch3\u003eThe Hummer Off-Road Durability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to withstand harsh off-road vibrations and severe trail duty, this converter delivers the structural rigidity required for reliable towing, hill climbing, and everyday operation without structural fatigue or premature failure.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67543931257080,"sku":"DS-EE7AHGBKL","price":147.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-hummer-h3-2007-2008-3-7l-front-1.jpg?v=1790695661","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-hummer-h3-2007-2008-3-7l-front","provider":"Performance Chip Tuning","version":"1.0","type":"link"}