{"product_id":"catalytic-converter-for-subaru-wrx-sti-2015-2018-2-5l","title":"Catalytic Converter for Subaru WRX STI (2015-2018) 2.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Catalytic Converter for 2015-2018 Subaru WRX STI (VA)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This direct-fit catalytic converter replaces the turbo-outlet pipe on 2015-2018 Subaru WRX STI (\u003cstrong\u003eVA\u003c\/strong\u003e) \u003cstrong\u003eEJ257 2.5L\u003c\/strong\u003e models to restore emissions control and flow.\u003c\/p\u003e\u003ch3\u003eThe Stock Subaru WRX STI Catalytic Converter Failure\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eVA\u003c\/strong\u003e chassis with the turbocharged \u003cstrong\u003eEJ257 2.5L\u003c\/strong\u003e boxer, the factory converter sits directly behind the turbocharger outlet under extreme exhaust heat. Repeated thermal cycling degrades the precious-metal washcoat and fractures the ceramic honeycomb substrate. Loose substrate pieces restrict exhaust flow and raise backpressure. Downstream oxygen sensors then mirror upstream readings, triggering catalyst efficiency faults and metallic rattles.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM Converter\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light:\u003c\/strong\u003e Stored \u003cstrong\u003eP0420\u003c\/strong\u003e or \u003cstrong\u003eP0430\u003c\/strong\u003e codes from lost catalyst oxygen storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Rattle:\u003c\/strong\u003e Metallic rattling from fractured ceramic substrate inside the converter housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackpressure \u0026amp; Emissions Failure:\u003c\/strong\u003e Plugged honeycomb cells hurt turbo spool and fail smog tests.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Stainless Catalytic Converter Solution\u003c\/h3\u003e\u003cp\u003eBuilt with corrosion-resistant stainless steel (\u003cstrong\u003e8 in\u003c\/strong\u003e length, \u003cstrong\u003e5 in\u003c\/strong\u003e height), this converter resists rust and heat cracking. Its ceramic honeycomb substrate uses a precious-metal washcoat to convert HC, CO, and NOx gases. Factory-matched turbo outlet, bracket, and 2-bolt rear flanges ensure direct bolt-on fitment without cutting or welding. This unit features \u003cstrong\u003eno O2 sensor ports\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x Catalytic Converter (\u003cstrong\u003eSRCZ004\/2\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli\u003e1 x Turbo Flange Gasket\u003c\/li\u003e\n\u003cli\u003e1 x 2-Bolt Flange Gasket\u003c\/li\u003e\n\u003cli\u003e4 x Bolts, Nuts, Washers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\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;\"\u003e2015-2018 Subaru WRX STI\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;\"\u003eEJ257 2.5L H4 \/ VA\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;\"\u003eEmissions \u0026amp; Substrate\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eEPA Federal (46-State Legal) \/ Ceramic Honeycomb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Welding)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2015-2018 Subaru WRX STI Base (2.5L Turbo)\u003c\/li\u003e\n\u003cli\u003e2015-2018 Subaru WRX STI Limited (2.5L Turbo)\u003c\/li\u003e\n\u003cli\u003e2015 Subaru WRX STI Launch Edition (2.5L Turbo)\u003c\/li\u003e\n\u003cli\u003e2016 Subaru WRX STI Series.HyperBlue (2.5L Turbo)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the VA WRX STI?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Fits 2015-2018 Subaru WRX STI \u003cstrong\u003eEJ257 2.5L\u003c\/strong\u003e models. \u003cstrong\u003eExcludes 2.0L WRX. Not CARB approved; illegal in CA, NY, CO, and ME.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0420\/P0430 codes, and are O2 sensors included?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, if converter-related.\u003c\/strong\u003e Restored catalyst efficiency clears \u003cstrong\u003eP0420\u003c\/strong\u003e\/\u003cstrong\u003eP0430\u003c\/strong\u003e codes after checking leaks and sensors. O2 sensors are excluded; reuse or replace yours.\u003c\/p\u003e\u003ch4\u003eAre gaskets and hardware included for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Gaskets and four bolts, nuts, and washers are included. Cool the exhaust, soak studs with penetrating oil, and torque evenly.\u003c\/p\u003e\u003ch3\u003eThe Subaru Performance Standard\u003c\/h3\u003e\u003cp\u003eEngineered for the \u003cstrong\u003eEJ257\u003c\/strong\u003e platform, this converter restores clean exhaust flow efficiency and reliable emissions control. Maintain strong spool and crisp throttle response.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68085735522552,"sku":"DS-E425WGEC5","price":236.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-subaru-wrx-sti-2015-2018-2-5l-1.jpg?v=1794549746","url":"https:\/\/performancechiptuning.com\/fr\/products\/catalytic-converter-for-subaru-wrx-sti-2015-2018-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}