{"product_id":"gesi-g-sport-gen1-epa-compliant-catalytic-converter-core-4-000-body-x-4-000-long-300-cpsi-50002","title":"G-Sport Gen1 HO EPA Compliant Catalytic Converter Core - 4.000\" Body x 4.000\" Long (50002)","description":"\u003cp\u003e\u003cstrong\u003eAlso available:\u003c\/strong\u003e \u003ca href=\"\/products\/g-sport-gesi-gen1-epa-compliant-catalytic-converter-core-4-500-body-x-4-000-long-300-cpsi-85000\"\u003eUHO 4.500\" Core (85002)\u003c\/a\u003e | \u003ca href=\"\/products\/g-sport-gesi-gen1-epa-compliant-catalytic-converter-core-6-pack-4-000-body-x-4-000-long-300-cpsi-650000\"\u003eFabricator 6-Pack (650002)\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eEPA-COMPLIANT CORE-ONLY FLOW FOR CUSTOM EXHAUST BUILDS — G-SPORT GEN1 ADVANCED HO CORE\u003c\/h5\u003e\n\u003cp\u003eThe G-Sport Gen1 Advanced HO Catalytic Converter Core (50002) is the \u003cstrong\u003ecore-only version of the Gen1 HO converter\u003c\/strong\u003e: a bare 4.000\" OD x 4.000\" long substrate canister ready for full custom integration on \u003cstrong\u003e1996–2016 OBD1\/OBD2 vehicles\u003c\/strong\u003e. Rated up to \u003cstrong\u003e500hp per core (per exhaust bank)\u003c\/strong\u003e, with the 300 CPSI cell density that gives Gen1 its flow advantage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis is the catalytic core only — transition cones are sold separately.\u003c\/strong\u003e The matching cones for a 4.000\" OD body are the \u003ca href=\"\/products\/gesi-g-sport-catalytic-converter-transition-cone-2-500-inlet-outlet-x-4-000-body-94025\"\u003e2.500\" Transition Cone (94025)\u003c\/a\u003e and \u003ca href=\"\/products\/gesi-g-sport-catalytic-converter-transition-cone-3-000-inlet-outlet-x-4-000-body-94030\"\u003e3.000\" Transition Cone (94030)\u003c\/a\u003e, or you can fabricate your own transitions.\u003c\/p\u003e\n\u003cp\u003eThe GEN1 Advanced series pairs GESi's proven \u003cstrong\u003eS-Wound metallic substrate in a 300 CPSI cell count\u003c\/strong\u003e with their proprietary precious-metal wash coat, which typically keeps catalyst-efficiency check engine lights off on 2016-and-older OBD systems. Building a 2017 or newer vehicle? Use the \u003ca href=\"\/products\/gesi-g-sport-gen2-epa-compliant-catalytic-converter-core-4-000-body-x-4-000-long-400-cpsi-85200\"\u003eGen2 HO Core (50200)\u003c\/a\u003e instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFEATURES\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore-only format\u003c\/strong\u003e for full custom exhaust integration — weld directly into your system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 CPSI S-Wound metallic substrate\u003c\/strong\u003e — thinner cell walls than ceramic and a lower cell density for maximum flow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProprietary precious-metal wash coat\u003c\/strong\u003e tuned for 1996–2016 OBD emissions monitoring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNickel-lined, furnace-brazed substrate\u003c\/strong\u003e locked to its stainless mantle — will not telescope or fail under boost\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 Series stainless steel construction\u003c\/strong\u003e; withstands exhaust temperature spikes up to \u003cstrong\u003e1,600°F\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEPA compliant\u003c\/strong\u003e — third-party lab tested (not CARB certified; not for use on emissions-controlled vehicles in California)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/8304\/files\/G-Sport-Advanced-Catalytic-NEW-cross-section-product-features-1920w.webp?v=1739989638\" alt=\"G-Sport Gen1 Advanced catalytic converter cross-section and construction features | Ace Race Parts\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eSPECIFICATIONS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSold As: Catalytic core only (transition cones sold separately)\u003c\/li\u003e\n\u003cli\u003eBody Diameter: 4.000\" OD\u003c\/li\u003e\n\u003cli\u003eOverall Length: 4.000\" (±0.125\")\u003c\/li\u003e\n\u003cli\u003eCell Count: 300 CPSI\u003c\/li\u003e\n\u003cli\u003eHP Rating: up to 500hp per core (per exhaust bank)\u003c\/li\u003e\n\u003cli\u003eSubstrate: S-Wound metallic, furnace-brazed\u003c\/li\u003e\n\u003cli\u003eMaterial: 300 Series stainless steel\u003c\/li\u003e\n\u003cli\u003eEPA Compliant: Yes (not CARB certified)\u003c\/li\u003e\n\u003cli\u003eWeight: 2.25 lbs\u003c\/li\u003e\n\u003cli\u003eConnection: Welding Required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePERFORMANCE\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn instrumented dyno testing with pressure probes upstream and downstream of the substrate, a properly sized G-Sport high-flow catalytic converter produced \u003cstrong\u003ehorsepower and torque curves identical to a straight pipe\u003c\/strong\u003e, with no measurable pressure drop across the core. Emissions reduction runs up to 99% for carbon monoxide, 98% for nitrogen oxides, and 95% for hydrocarbons.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/8304\/files\/G-Sport-Dyno-Test-Horsepower-and-Torque-Dodge-Viper-1-1920w_600x600.webp?v=1739990090\" alt=\"G-Sport high-flow catalytic converter dyno test results, horsepower and torque | Ace Race Parts\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eAPPLICATIONS \u0026amp; FITMENT\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eChoose the Gen1 HO core for custom builds up to \u003cstrong\u003e500hp per exhaust bank\u003c\/strong\u003e on 1996–2016 vehicles. Building past 500hp? The \u003ca href=\"\/products\/g-sport-gesi-gen1-epa-compliant-catalytic-converter-core-4-500-body-x-4-000-long-300-cpsi-85000\"\u003eGen1 UHO Core (85002)\u003c\/a\u003e is rated to 850hp. Prefer a weld-ready converter with cones already installed? See the \u003ca href=\"\/products\/gesi-g-sport-uho-2-500-inlet-outlet-gen2-epa-compliant-catalytic-converter-400-cpsi-50022\"\u003eGen1 HO 2.500\" (50022)\u003c\/a\u003e and \u003ca href=\"\/products\/gesi-g-sport-ho-3-000-inlet-outlet-gen1-epa-compliant-catalytic-converter-300-cpsi-50030\"\u003eGen1 HO 3.000\" (50032)\u003c\/a\u003e assemblies. Gen1's extra flow also makes this core the recommended choice for the unmonitored \u003cstrong\u003esecondary position\u003c\/strong\u003e in two-converter-per-bank systems — even on 2017+ vehicles with a Gen2 primary.\u003c\/p\u003e\n\u003cp\u003eFor the full selection guide, see \u003ca href=\"\/blogs\/news\/understanding-the-g-sport-catalytic-converter-lineup\"\u003eUnderstanding the G-Sport Catalytic Converter Lineup\u003c\/a\u003e and our \u003ca href=\"\/blogs\/news\/g-sport-catalytic-converters-explained-generations-performance-ratings-and-installation-tips\"\u003eG-Sport FAQ\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/8304\/files\/4-1920w.webp?v=1739989768\" alt=\"G-Sport GEN1 vs GEN2 vs Non-EPA catalytic converter comparison chart | Ace Race Parts\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eINSTALLATION NOTES\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis core welds into your system via transition cones (94025 or 94030 for this body size) or custom-fabricated transitions. For best catalyst light-off and CEL prevention, install it as close to the OEM converter location as practical — on custom systems, within 8\"–24\" of the turbo outlet or header collector. In dual-bank systems, run the \u003cstrong\u003esame core model on both banks\u003c\/strong\u003e; mixing generations or sizes between banks can cause uneven backpressure and inconsistent O2 readings. Full best practices, common mistakes, and a pre-flight checklist are in our \u003ca href=\"\/blogs\/g-sport\/g-sport-catalytic-converter-installation-guidelines\"\u003eG-Sport Installation Guidelines\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eNot sure which generation or output tier your build needs? Email us at \u003ca href=\"mailto:support@aceraceparts.com\"\u003esupport@aceraceparts.com\u003c\/a\u003e with your platform, power goal, and tubing size and we will point you to the right part.\u003c\/p\u003e","brand":"G-Sport","offers":[{"title":"Default Title","offer_id":39399994425407,"sku":"GSP50002","price":600.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/8304\/products\/5b8ea40043c02ffb3e6626a3777aa0b5.png?v=1626739330","url":"https:\/\/www.aceraceparts.com\/products\/gesi-g-sport-gen1-epa-compliant-catalytic-converter-core-4-000-body-x-4-000-long-300-cpsi-50002","provider":"Ace Race Parts","version":"1.0","type":"link"}