{"product_id":"catalytic-converter-for-subaru-impreza-2002-2005-2-5l-front-rear","title":"Catalytic Converter for Subaru Impreza (2002-2005) 2.5L Front\/Rear","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Stainless Steel Catalytic Converter for 2002-2005 Subaru Impreza (GD\/GG)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Direct-Fit Catalytic Converter replaces deteriorated emissions assemblies on the 2002-2005 Subaru Impreza to clear catalyst efficiency codes and restore unrestricted exhaust flow.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Subaru Impreza Thermal Degradation Problem\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust setups on the \u003cstrong\u003eGD\/GG\u003c\/strong\u003e chassis subject the integrated dual-converter assembly to extreme thermal cycling and uneven exhaust pulses inherent to the horizontally opposed boxer engine. Over prolonged service, the naturally aspirated \u003cstrong\u003eEJ251\u003c\/strong\u003e and \u003cstrong\u003eEJ253\u003c\/strong\u003e platforms suffer washcoat erosion, precious metal sintering, and thermal fracturing of the internal ceramic brick. This catalytic decay results in persistent P0420 trouble codes, tailpipe emissions failures, and elevated exhaust backpressure that strangles mid-range torque.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-replacement converter utilizes a high-flow ceramic honeycomb substrate coated with an active catalyst washcoat designed to restore clean reduction and oxidation reactions. Encased in a heavy-gauge stainless steel shell, the assembly features mandrel-formed transitions, OE-matched oxygen sensor bungs, and thick welded mounting flanges that mate flush with factory exhaust sections. TIG and robotic MIG welds resist corrosion and road salt pitting, while the ceramic core maintains uniform cross-sectional flow to minimize backpressure without custom fabrication.\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: solid font-size: min-width:\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;\"\u003e2002-2005 Subaru Impreza (Naturally Aspirated)\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;\"\u003eEJ251\/EJ253 2.5L \/ GD (Sedan), GG (Wagon)\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;\"\u003e165 hp \/ 166 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;\"\u003eQS414752QR\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\u003e2002-2005 Subaru Impreza 2.5 RS (Sedan, 2.5L SOHC EJ25)\u003c\/li\u003e\n  \u003cli\u003e2002-2004 Subaru Impreza 2.5 TS (Sport Wagon, 2.5L SOHC EJ25)\u003c\/li\u003e\n  \u003cli\u003e2002-2005 Subaru Impreza Outback Sport (Wagon, 2.5L SOHC EJ25)\u003c\/li\u003e\n  \u003cli\u003eFits naturally aspirated 2.5L non-turbo models only; excludes turbo WRX \/ STi.\u003c\/li\u003e\n  \u003cli\u003e48-state legal emissions design; non-CARB compliant (cannot ship to CA or NY).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GD\/GG Impreza?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2002-2005 Subaru Impreza equipped with the naturally aspirated 2.5L EJ-series boxer engine.\u003c\/p\u003e\n\n\u003ch4\u003eWill this converter resolve a recurring P0420 catalytic efficiency diagnostic trouble code?\u003c\/h4\u003e\n\u003cp\u003eYes, replacing a degraded factory substrate with this complete unit restores secondary oxygen sensor readouts within factory stoichiometric thresholds.\u003c\/p\u003e\n\n\u003ch3\u003eThe Subaru Boxer Caliber\u003c\/h3\u003e\n\u003cp\u003eMaintaining efficient cylinder scavenging on naturally aspirated boxer architectures demands strict flow uniformity to retain low-end power band responsiveness across all four driven wheels.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67543935451384,"sku":"DS-E6XFZXTUN","price":142.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-subaru-impreza-2002-2005-2-5l-front-rear-1.jpg?v=1790696017","url":"https:\/\/performancechiptuning.com\/fr\/products\/catalytic-converter-for-subaru-impreza-2002-2005-2-5l-front-rear","provider":"Performance Chip Tuning","version":"1.0","type":"link"}