{"product_id":"catalytic-converter-for-bmw-325i-330i-330ci-2001-2006-2-5l-3-0l","title":"Catalytic Converter for BMW 325i 330i 330Ci (2001-2006) 2.5L 3.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Stainless Steel Catalytic Converter for 2001-2006 BMW 3 Series (E46)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit catalytic converter replaces the clogged or degraded factory emissions unit on the 2001-2006 BMW 3 Series to restore exhaust flow, balance secondary lambda sensor feedback, and extinguish catalyst efficiency trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock BMW 3 Series Catalyst Breakdown\u003c\/h3\u003e\n\u003cp\u003eHigh-mileage \u003cstrong\u003eM54B25\u003c\/strong\u003e and \u003cstrong\u003eM54B30\u003c\/strong\u003e engines commonly experience crankcase ventilation valve (CCV) failure, leading to oil consumption that directly contaminates the factory catalytic washcoat. Over time, thermal cycling and unburnt hydrocarbons break down the internal ceramic substrate, causing physical crumbling, flow restrictions, and loss of precious metal washcoat effectiveness. This manifests as persistent \u003cstrong\u003eP0420\u003c\/strong\u003e and \u003cstrong\u003eP0430\u003c\/strong\u003e diagnostic trouble codes, reduced top-end exhaust gas velocity, rattling exhaust canisters, and failed tailpipe emissions tests.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a direct bolt-on replacement, this unit features a heavy-gauge 409 stainless steel outer casing that resists road brine and galvanic corrosion. Inside, a high-efficiency flow-through ceramic honeycomb substrate is coated with active noble metals to process hydrocarbons, carbon monoxide, and NOx into inert gases. Integrated precision-tapped pre- and post-catalyst oxygen sensor bungs maintain factory \u003cstrong\u003eSiemens MS43\/MS45\u003c\/strong\u003e DME closed-loop control. Laser-cut mounting flanges match OEM mid-pipe geometry exactly, eliminating exhaust leaks without requiring pipe cutting, sleeve adapters, or custom TIG welding.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Direct-Fit Catalytic Converter\u003c\/li\u003e\n  \u003cli\u003eMounting Hardware\u003c\/li\u003e\n\u003c\/ul\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;\"\u003e2001-2006 BMW 3 Series\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;\"\u003eM54B25, M54B30 \/ E46\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;\"\u003e184-225 hp \/ 175-214 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\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001-2005 BMW 325i 2.5L (E46)\u003c\/li\u003e\n  \u003cli\u003e2001-2006 BMW 330i 3.0L (E46)\u003c\/li\u003e\n  \u003cli\u003e2001-2006 BMW 330Ci 3.0L (E46)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the E46 3 Series?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2001-2006 BMW 3 Series equipped with the \u003cstrong\u003eM54\u003c\/strong\u003e 2.5L and 3.0L engines. \u003cstrong\u003eNotice: This is a 48-State EPA-compliant part; it is NOT CARB-approved and cannot be shipped to or registered in California, Colorado, New York, or Maine.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to cut or weld during installation?\u003c\/h4\u003e\n\u003cp\u003eNo, this unit is engineered with factory-matching flanges and sensor ports to allow complete bolt-on installation using standard hand tools.\u003c\/p\u003e\n\n\u003ch3\u003eThe BMW Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEuropean engine management systems rely on micro-voltage feedback from secondary O2 sensors to govern engine trims. Installing this properly matched converter ensures zero check engine lights, accurate downstream lambda readings, and restored exhaust backpressure for your \u003cstrong\u003eE46\u003c\/strong\u003e.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67901594730744,"sku":"DS-E546VAJKP","price":292.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-bmw-325i-330i-330ci-2001-2006-2-5l-3-0l-1.jpg?v=1793339228","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-bmw-325i-330i-330ci-2001-2006-2-5l-3-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}