{"product_id":"catalytic-converter-for-subaru-forester-1999-2006-2-5l-front-rear","title":"Catalytic Converter for Subaru Forester (1999-2006) 2.5L Front\/Rear","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Replacement Catalytic Converter Assembly for 1999-2006 Subaru Forester (SF \/ SG)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Direct-Fit Catalytic Converter replaces the degraded factory emissions unit on the 1999-2006 Subaru Forester to clear catalyst efficiency DTCs, restore correct exhaust scavenging, and maintain legal tailpipe emissions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Subaru Forester Catalytic Converter Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust converters on the naturally aspirated \u003cstrong\u003eEJ25\u003c\/strong\u003e boxer engine frequently succumb to high-mileage thermal fatigue and hydrocarbon poisoning. Prolonged exposure to rich cold-start cycles and typical head gasket weeping leads to thermal washcoat sintering and ceramic substrate crumbling. Once the internal core degrades, exhaust backpressure spikes, engine scavenging slows, and the ECU triggers an immediate P0420 catalyst efficiency diagnostic trouble code.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement exhaust assembly is engineered to OE geometric standards for seamless integration into the \u003cstrong\u003eSF\u003c\/strong\u003e and \u003cstrong\u003eSG\u003c\/strong\u003e chassis exhaust layout. Manufactured with a high-grade 409 stainless steel outer casing and a high-flow ceramic honeycomb substrate, it delivers exceptional thermal resistance against core meltdown. Precision-welded factory-spec flanges and integrated upstream and downstream O2 sensor bungs eliminate exhaust leaks and protect sensor signal integrity. Mandrel-routed transition pipes maintain optimal gas velocity without choke points, matching factory exhaust backpressure requirements across the entire rev range.\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;\"\u003e1999-2006 Subaru Forester\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 \/ SF, SG\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\u003e1999-2002 Subaru Forester Base, L, S (2.5L H4 Naturally Aspirated, SF Chassis)\u003c\/li\u003e\n  \u003cli\u003e2003-2006 Subaru Forester X, XS, 2.5 X, 2.5 XS, L.L. Bean Edition (2.5L H4 Naturally Aspirated, SG Chassis)\u003c\/li\u003e\n  \u003cli\u003eExcludes all turbocharged \/ XT models\u003c\/li\u003e\n  \u003cli\u003eEPA 48-State compliant (Not legal for sale or use in California or New York)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the SF and SG Chassis Forester?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1999-2006 Subaru Forester equipped with the naturally aspirated \u003cstrong\u003eEJ25\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eWill this unit clear my P0420 check engine light?\u003c\/h4\u003e\n\u003cp\u003eYes, provided your upstream air-fuel sensors, ignition components, and engine mechanical timings are operating properly, this new converter restores catalytic reduction efficiency to turn off P0420 error codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Subaru Boxer Standard\u003c\/h3\u003e\n\u003cp\u003ePreserve the balance, raw exhaust tone, and flat-four scavenging dynamics of your Subaru boxer powertrain. This emissions assembly delivers the exact backpressure balance and robust flow capacity needed to keep your AWD platform running clean and responsive for miles to come.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67543934959864,"sku":"DS-EOK7YHMQQ","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-forester-1999-2006-2-5l-front-rear-1.jpg?v=1790695944","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-subaru-forester-1999-2006-2-5l-front-rear","provider":"Performance Chip Tuning","version":"1.0","type":"link"}