{"product_id":"catalytic-converter-for-hyundai-sonata-2015-2018-2-4l-rear","title":"Catalytic Converter for Hyundai Sonata (2015-2018) 2.4L Rear","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Rear Catalytic Converter for 2015-2018 Hyundai Sonata (LF)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The rear catalytic converter replaces the degraded secondary emissions assembly and flex pipe on the 2015-2018 Sonata to resolve P0420 catalyst efficiency codes, seal exhaust leaks, and restore proper exhaust scavenging.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Hyundai Sonata Substrate Breakdown \u0026amp; Flex Pipe Shear\u003c\/h3\u003e\n\u003cp\u003eUnder continuous heat cycles and road vibration, the factory catalytic converter on the \u003cstrong\u003eLF\u003c\/strong\u003e chassis Sonata experiences thermal washcoat depletion. This loss of precious metal loading triggers recurring P0420\/P0430 diagnostic trouble codes and causes rotten-egg sulfur odors. Concurrently, engine rocking under load places cyclic fatigue on the factory integrated flex section, inducing structural bellows cracks, exhaust gas leaks, and false upstream oxygen sensor readings that handicap fuel trim accuracy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed with a heavy-gauge stainless steel outer shell and a durable ceramic honeycomb substrate, this direct-fit rear converter provides the cell density required for thorough HC\/CO oxidation while maintaining unchoked exhaust throughput. Precision-welded 2-bolt inlet and outlet flanges mirror the OEM exhaust geometry, mating directly to the downpipe and mid-pipe without cutting or welding. Engineered as a direct mechanical replacement for OEM part numbers \u003cstrong\u003e28600C2400\u003c\/strong\u003e, \u003cstrong\u003e28600C2560\u003c\/strong\u003e, and \u003cstrong\u003e54965\u003c\/strong\u003e, it restores proper backpressure balance on the \u003cstrong\u003eTheta II\u003c\/strong\u003e platform.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1x Direct-Fit Rear Catalytic Converter with Integrated Flex Pipe\u003c\/li\u003e\n  \u003cli\u003eExhaust Flange Gaskets\u003c\/li\u003e\n  \u003cli\u003eMounting Bolts and 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;\"\u003e2015-2018 Hyundai Sonata\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;\"\u003e2.4L Theta II (G4KJ) \/ LF\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;\"\u003e185 hp \/ 178 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;\"\u003e28600C2400, 28600C2560, 54965\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\u003e2015-2018 Hyundai Sonata 2.4L L4 Gas (SE, Sport, Limited)\u003c\/li\u003e\n  \u003cli\u003ePosition: Rear Underfloor (Flex-Pipe Converter Assembly)\u003c\/li\u003e\n  \u003cli\u003eEPA 48-State Legal (Restricted: Not legal for sale or shipment to CA, CO, NY, ME)\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 LF Sonata?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2015-2018 Hyundai Sonata equipped with the 2.4L \u003cstrong\u003eTheta II G4KJ\u003c\/strong\u003e engine. \u003cstrong\u003eExcludes 2.0L Turbo models and Sonata Hybrid or Plug-in Hybrid variants.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to weld this unit to complete installation?\u003c\/h4\u003e\n\u003cp\u003eNo, this assembly is engineered with factory-pattern 2-bolt flanges for a completely bolt-on replacement using standard hand tools and the supplied hardware.\u003c\/p\u003e\n\n\u003ch3\u003eThe Hyundai Commuter Standard\u003c\/h3\u003e\n\u003cp\u003ePreserve factory cabin quietness and emissions compliance in your \u003cstrong\u003eLF\u003c\/strong\u003e Sonata with a bolt-on assembly engineered to clear check engine lights and survive daily thermal cycling.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67901837639928,"sku":"DS-EGFRX4PFY","price":131.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-hyundai-sonata-2015-2018-2-4l-rear-1.jpg?v=1793341514","url":"https:\/\/performancechiptuning.com\/products\/catalytic-converter-for-hyundai-sonata-2015-2018-2-4l-rear","provider":"Performance Chip Tuning","version":"1.0","type":"link"}