{"product_id":"catalytic-converter-for-pontiac-grand-prix-2004-2008-3-8l","title":"Catalytic Converter for Pontiac Grand Prix (2004-2008) 3.8L","description":"\u003ch2\u003eDirect-Fit Catalytic Converter for 2004-2008 Pontiac Grand Prix\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the restricted or degraded OEM exhaust converter assembly to restore nominal backpressure, eliminate catalyst efficiency DTCs (P0420), and maintain emissions compliance without custom fabrication.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Grand Prix Exhaust Restriction \u0026amp; Substrate Degradation\u003c\/h3\u003e\n\u003cp\u003eHigh-mileage GM W-body exhaust systems routinely suffer from internal substrate breakdown. Thermal fatigue, unburnt hydrocarbon exposure, and typical 3800 V6 PCV oil vapor accumulation degrade the factory precious-metal washcoat, eventually leading to melted or fractured ceramic monoliths. This physical restriction severely impedes exhaust gas velocity, drives up cylinder head temperatures, saps mid-range torque, and triggers persistent check engine warnings due to downstream oxygen sensor cross-count failures.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a bolt-in replacement, this converter features an anti-corrosive stainless steel shell housing a high-efficiency ceramic honeycomb monolith. The optimized cell density maximizes surface-area conversion efficiency while preserving low exhaust restriction. Precision-stamped flanges match OEM exhaust routing, integrating directly into the stock exhaust geometry with included hardware and sealing gaskets to eliminate exhaust leaks and protect sensor reporting.\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;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2004-2008 Pontiac Grand Prix 3.8L\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3800 Series III (L26) \/ W-Body\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e200 hp \/ 230 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBER512055 (OE: 54752, 642278, 41422)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Pontiac Grand Prix 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e2005 Pontiac Grand Prix 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e2006 Pontiac Grand Prix 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e2007 Pontiac Grand Prix 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e2008 Pontiac Grand Prix 3.8L V6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Pontiac Performance Caliber\u003c\/h3\u003e\n\u003cp\u003eCalibrated specifically for the flow dynamics and pulse characteristics of the GM 3.8L pushrod engine, this unit sustains stable low-end exhaust scavenging while delivering consistent downstream catalytic oxidation under heavy engine load.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50489353961720,"sku":"DS-EUDMNZ0JX","price":138.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-pontiac-grand-prix-2004-2008-3-8l-1.jpg?v=1789160128","url":"https:\/\/performancechiptuning.com\/fr\/products\/catalytic-converter-for-pontiac-grand-prix-2004-2008-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}