{"product_id":"catalytic-converter-for-pontiac-grand-prix-1997-2003-3-8l","title":"Catalytic Converter for Pontiac Grand Prix (1997-2003) 3.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Stainless Catalytic Converter for 1997-2003 Pontiac Grand Prix (W-Body)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit catalytic converter replaces clogged or degraded factory emissions units on the 1997-2003 Grand Prix to eliminate P0420 fault codes, normalize exhaust backpressure, and restore engine volumetric efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Pontiac Grand Prix Catalyst and Flex Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust assemblies on the sixth-generation \u003cstrong\u003eW-Body\u003c\/strong\u003e platform commonly suffer structural breakdown at the integrated flex section and internal catalytic monolith. Over extended heat cycles, the factory ceramic substrate suffers thermal fatigue, carbon washcoat fouling, and matrix sintering, leading to reduced exhaust velocity, unmetered pre-cat oxygen contamination, and chronic P0420 catalytic efficiency trouble codes. Additionally, road salt and continuous engine vibration fracture the factory mild steel intermediate joints and fatigue the OEM braided flex coupling, resulting in severe exhaust leaks and inaccurate upstream\/downstream O2 sensor feedback loops.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement converter assembly is engineered with a corrosion-resistant 409 stainless steel outer casing and a heavy-duty double-braided internal flex pipe designed to absorb transverse torque movement from the transverse \u003cstrong\u003e3800 Series II (L36)\u003c\/strong\u003e engine. Inside, a high-flow honeycomb ceramic washcoat loaded with noble metal catalysts ensures rapid light-off times and thorough catalytic reduction without choking post-manifold exhaust scavenging. Designed to factory-geometry specs, the CNC-machined flanges bolt directly to the factory downpipe and intermediate cat-back piping using standard mounting hardware, preserving original oxygen sensor port locations and clearance around the rear subframe.\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;\"\u003e1997-2003 Pontiac Grand Prix\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;\"\u003e3800 Series II (L36\/L67) \/ W-Body\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;\"\u003e200 hp \/ 225 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;\"\u003e54627, 3022002, 16567, 642583, 50321\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\u003e1997-2003 Pontiac Grand Prix SE 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e1997-2003 Pontiac Grand Prix GT 3.8L V6\u003c\/li\u003e\n  \u003cli\u003e1997-2003 Pontiac Grand Prix GTP 3.8L V6 (Check local emissions compliance)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the W-Body Grand Prix?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1997-2003 Pontiac Grand Prix equipped with the \u003cstrong\u003e3800 Series II\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eWill this unit clear the P0420 catalytic efficiency diagnostic trouble code?\u003c\/h4\u003e\n\u003cp\u003eYes, the high-efficiency ceramic substrate restores clean catalytic reduction to return downstream O2 sensor voltages within the factory ECM operating window.\u003c\/p\u003e\n\n\u003ch3\u003eThe Pontiac Muscle Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle high-flow exhaust pulses, this converter maintains precise backpressure thresholds to ensure the 3.8L pushrod powertrain delivers factory-rated mid-range torque and clean wide-open-throttle performance.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67543934075128,"sku":"DS-EDG7JUKH3","price":126.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-pontiac-grand-prix-1997-2003-3-8l-1.jpg?v=1790695872","url":"https:\/\/performancechiptuning.com\/fr\/products\/catalytic-converter-for-pontiac-grand-prix-1997-2003-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}