Catalytic Converters & Accessories — G-Sport by GESi®
G-Sport by GESi® builds high-flow catalytic converters that give up nothing: in instrumented dyno testing, a properly sized G-Sport cat matched a straight pipe line for line, while cutting carbon monoxide up to 99%. Every converter is built in North America around GESi's furnace-brazed S-Wound metallic substrate, Double-Lock canned in stainless steel, and (outside the dedicated race line) EPA compliant — street-legal performance outside CARB states.
The line is organized by generation and application: Gen1 (300 CPSI) for 1996–2016 vehicles, Gen2 (400 CPSI) for 2017 and newer with tiers to 1,200hp, OEM-style Mid-Bed dual-brick converters, Non-EPA race converters, Diesel Oxidation Catalysts, and Transition Cones for core-only builds. New to the lineup? Start with Understanding the G-Sport Catalytic Converter Lineup.
Founded by record-breaking NHRA Pro Mod driver Eric Latino, GESi has engineered emissions solutions for high-horsepower builds since 2001 — and as a G-Sport Preferred Vendor, Ace Race Parts keeps the full line stocked in our Washington warehouse for same-day shipping.
Read LessG-Sport OBD2 Non-EPA Compliant Catalytic Converter - 2.500" Inlet/Outlet (10025)
Also available in: 3.000" Inlet/Outlet (10030) | Fabricator 6-Pack (610025) HIGH-FLOW EMISSIONS REDUCTION FOR OFF-ROAD, RACE, AND PRE-1973 VEHICLES...
View full detailsG-Sport OBD2 Non-EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (10030)
Also available in: 2.500" Inlet/Outlet (10025) | Fabricator 6-Pack (610030) HIGH-FLOW EMISSIONS REDUCTION FOR OFF-ROAD, RACE, AND PRE-1973 VEHICLES...
View full detailsG-Sport OBD2 DOC (Diesel Oxidation Catalyst) Non-EPA Compliant Catalytic Converter - 2.500" Inlet/Outlet (12025)
Also available in: 3.000" Inlet/Outlet (12030) | 6.000" Body / 3.000" Inlet-Outlet (12230) HIGH-FLOW EXHAUST CLEANUP FOR 2.500" DIESEL SYSTEMS — G-...
View full detailsG-Sport OBD2 DOC (Diesel Oxidation Catalyst) Non-EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (12030)
Also available in: 6.000" Body / 3.000" Inlet-Outlet (12230) HIGH-FLOW EXHAUST CLEANUP FOR CUSTOM DIESEL BUILDS — G-SPORT DOC (DIESEL OXIDATION CAT...
View full detailsG-Sport OBD2 DOC (Diesel Oxidation Catalyst) Non-EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (12230)
Also available in: 4.000" Body / 3.000" Inlet-Outlet (12030) MAXIMUM SUBSTRATE AREA FOR HIGH-FLOW DIESEL BUILDS — G-SPORT DOC, 6.000" BODY NOTE: G-...
View full detailsG-Sport Gen1 HO EPA Compliant Catalytic Converter - 2.500" Inlet/Outlet (50022)
Also available in: 3.000" Inlet/Outlet (50032) | Fabricator 6-Pack (650022) EPA-COMPLIANT HIGH-FLOW PERFORMANCE FOR 1996–2016 VEHICLES — G-SPORT GE...
View full detailsG-Sport Gen1 HO EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (50032)
Also available in: 2.500" Inlet/Outlet (50022) | Fabricator 6-Pack (650032) EPA-COMPLIANT HIGH-FLOW PERFORMANCE FOR 1996–2016 VEHICLES — G-SPORT GE...
View full detailsG-Sport Gen1 UHO EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (85032)
Also available in: 4.000" Inlet/Outlet (85042) | Fabricator 6-Pack (685032) 850HP OF EPA-COMPLIANT FLOW FOR 1996–2016 VEHICLES — G-SPORT GEN1 ADVAN...
View full detailsG-Sport Gen1 UHO EPA Compliant Catalytic Converter - 4.000" Inlet/Outlet (85042)
Also available in: 3.000" Inlet/Outlet (85032) | UHO Core 6-Pack (685002) 850HP OF EPA-COMPLIANT FLOW FOR BIG-BORE EXHAUST SYSTEMS — G-SPORT GEN1 A...
View full detailsG-Sport Gen2 HO EPA Compliant Catalytic Converter - 2.500" Inlet/Outlet (50225)
Also available in: 3.000" Inlet/Outlet (50230) | Fabricator 6-Pack (650225) EPA-COMPLIANT HIGH-FLOW PERFORMANCE FOR 2017 AND NEWER VEHICLES — G-SPO...
View full detailsG-Sport Gen2 HO EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (50230)
Also available in: 2.500" Inlet/Outlet (50225) | Fabricator 6-Pack (650230) EPA-COMPLIANT HIGH-FLOW PERFORMANCE FOR 2017 AND NEWER VEHICLES — G-SPO...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (85230)
Also available in: 4.000" Inlet/Outlet (85240) | Fabricator 6-Pack (685230) 850HP OF EPA-COMPLIANT FLOW FOR 2017 AND NEWER VEHICLES — G-SPORT GEN2 ...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter - 4.000" Inlet/Outlet (85240)
Also available in: 3.000" Inlet/Outlet (85230) | Fabricator 6-Pack (685240) 850HP OF EPA-COMPLIANT FLOW FOR BIG-BORE EXHAUST SYSTEMS — G-SPORT GEN2...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter Core - 4.500" Body x 7.000" Long - Mid-Bed Series (24501)
Also available: With 3.000" cones installed (24531) | UHO+ 5.000" Mid-Bed Core (25001) OEM-STYLE DUAL-BRICK DESIGN WITH A MID-BED O2 PORT — G-SPORT...
View full detailsG-Sport Gen2 UHO+ EPA Compliant Catalytic Converter Core - 5.000" Body x 7.000" Long - Mid-Bed Series (25001)
Also available: With 3.000" cones installed (25031) | UHO 4.500" Mid-Bed Core (24501) 1,000HP OEM-STYLE DUAL-BRICK DESIGN WITH A MID-BED O2 PORT — ...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet - Mid-Bed Series (24531)
Also available: Core only, no cones (24501) | UHO+ Mid-Bed 3.000" (25031) OEM-STYLE DUAL-BRICK DESIGN, WELD-READY WITH 3.000" CONES — G-SPORT GEN2 ...
View full detailsG-Sport Gen2 UHO+ EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet - Mid-Bed Series (25031)
Also available: Core only, no cones (25001) | UHO Mid-Bed 3.000" (24531) 1,000HP OEM-STYLE DUAL-BRICK DESIGN, WELD-READY WITH 3.000" CONES — G-SPOR...
View full detailsG-Sport Gen1 HO EPA Compliant Catalytic Converter Core - 4.000" Body x 4.000" Long (50002)
Also available: UHO 4.500" Core (85002) | Fabricator 6-Pack (650002) EPA-COMPLIANT CORE-ONLY FLOW FOR CUSTOM EXHAUST BUILDS — G-SPORT GEN1 ADVANCED...
View full detailsG-Sport Gen1 UHO EPA Compliant Catalytic Converter Core - 4.500" Body x 4.000" Long (85002)
Also available: HO 4.000" Core (50002) | Fabricator 6-Pack (685002) 850HP OF EPA-COMPLIANT FLOW, CORE ONLY — G-SPORT GEN1 ADVANCED UHO CORE The G-S...
View full detailsG-Sport Gen2 HO EPA Compliant Catalytic Converter Core - 4.000" Body x 4.000" Long (50200)
Also available: UHO 4.500" Core (85200) | Fabricator 6-Pack (650200) EPA-COMPLIANT CORE-ONLY FLOW FOR CUSTOM EXHAUST BUILDS — G-SPORT GEN2 ADVANCED...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter Core - 4.500" Body x 4.000" Long (85200)
Also available: HO 4.000" Core (50200) | UHO+ 5.000" Core (85500) | Fabricator 6-Pack (685200) 850HP OF EPA-COMPLIANT FLOW, CORE ONLY — G-SPORT GEN...
View full detailsG-Sport Gen2 UHO+ EPA Compliant Catalytic Converter Core - 5.000" Body x 4.000" Long (85500)
Also available: UHO 4.500" Core (85200) | UHOX 6.000" Core (85600) 1,000HP-RATED EPA-COMPLIANT FLOW, CORE ONLY — G-SPORT GEN2 ADVANCED UHO+ CORE Th...
View full detailsG-Sport Gen2 UHOX EPA Compliant Catalytic Converter Core - 6.000" Body x 4.000" Long (85600)
Also available: UHO+ 5.000" Core (85500) | UHO 4.500" Core (85200) 1,200HP OF EPA-COMPLIANT FLOW — G-SPORT GEN2 ADVANCED UHOX, THE LARGEST CORE IN ...
View full detailsG-Sport Transition Cone For 4.000" OD Body Catalytic Converters - 2.500" Inlet/Outlet (94025)
Also available: 3.000" x 4.000" Body (94030) | 3.000" x 4.500" Body (94530) SMOOTH TRANSITIONS FOR G-SPORT CATALYTIC CORES — 2.500" TUBING TO 4.000...
View full detailsG-Sport Transition Cone For 4.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (94030)
Also available: 2.500" x 4.000" Body (94025) | 3.000" x 4.500" Body (94530) SMOOTH TRANSITIONS FOR G-SPORT CATALYTIC CORES — 3.000" TUBING TO 4.000...
View full detailsG-Sport Transition Cone For 6.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (96030)
Also available: 3.000" x 5.000" Body (95530) | 3.000" x 4.500" Body (94530) SMOOTH TRANSITIONS FOR THE G-SPORT UHOX CORE — 3.000" TUBING TO 6.000" ...
View full detailsG-Sport Transition Cone For 5.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (95530)
Also available: 3.000" x 4.500" Body (94530) | 3.000" x 6.000" Body (96030) SMOOTH TRANSITIONS FOR THE G-SPORT UHO+ CORE — 3.000" TUBING TO 5.000" ...
View full detailsG-Sport Transition Cone For 4.500" OD Body Catalytic Converters - 3.000" Inlet/Outlet (94530)
Also available: 3.000" x 4.000" Body (94030) | 3.000" x 5.000" Body (95530) SMOOTH TRANSITIONS FOR G-SPORT UHO CORES — 3.000" TUBING TO 4.500" BODY...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter 6 Pack - 3.000" Inlet/Outlet (685230)
Also available: Single unit (85230) | 6-Pack in 4.000" (685240) FABRICATOR 6-PACK — G-SPORT GEN2 ADVANCED UHO CATALYTIC CONVERTERS, 3.000" This lis...
View full detailsG-Sport Gen2 HO EPA Compliant Catalytic Converter 6 Pack - 3.000" Inlet/Outlet (650230)
Also available: Single unit (50230) | 6-Pack in 2.500" (650225) FABRICATOR 6-PACK — G-SPORT GEN2 ADVANCED HO CATALYTIC CONVERTERS, 3.000" This list...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter 6 Pack - 4.000" Inlet/Outlet (685240)
Also available: Single unit (85240) | 6-Pack in 3.000" (685230) FABRICATOR 6-PACK — G-SPORT GEN2 ADVANCED UHO CATALYTIC CONVERTERS, 4.000" This lis...
View full detailsG-Sport Gen2 UHO EPA Compliant Catalytic Converter Core 6 Pack - 4.500" Body x 4.000" Long (685200)
Also available: Single core (85200) | HO Core 6-Pack (650200) FABRICATOR 6-PACK — G-SPORT GEN2 ADVANCED UHO CATALYTIC CONVERTER CORES, 4.500" BODY ...
View full detailsG-Sport Gen1 UHO EPA Compliant Catalytic Converter 6 Pack - 3.000" Inlet/Outlet (685032)
Also available: Single unit (85032) | HO 6-Pack in 3.000" (650032) FABRICATOR 6-PACK — G-SPORT GEN1 ADVANCED UHO CATALYTIC CONVERTERS, 3.000" This ...
View full detailsG-Sport Gen1 UHO EPA Compliant Catalytic Converter Core 6 Pack - 4.500" Body x 4.000" Long (685002)
Also available: Single core (85002) | HO Core 6-Pack (650002) FABRICATOR 6-PACK — G-SPORT GEN1 ADVANCED UHO CATALYTIC CONVERTER CORES, 4.500" BODY ...
View full detailsG-Sport Gen2 HO EPA Compliant Catalytic Converter 6 Pack- 2.500" Inlet/Outlet (650225)
Also available: Single unit (50225) | 6-Pack in 3.000" (650230) FABRICATOR 6-PACK — G-SPORT GEN2 ADVANCED HO CATALYTIC CONVERTERS, 2.500" This list...
View full detailsG-Sport Gen2 HO EPA Compliant Catalytic Converter Core 6 Pack - 4.000" Body x 4.000" Long (650200)
Also available: Single core (50200) | UHO Core 6-Pack (685200) FABRICATOR 6-PACK — G-SPORT GEN2 ADVANCED HO CATALYTIC CONVERTER CORES, 4.000" BODY ...
View full detailsG-Sport Gen1 HO EPA Compliant Catalytic Converter 6 Pack - 3.000" Inlet/Outlet (650032)
Also available: Single unit (50032) | 6-Pack in 2.500" (650022) FABRICATOR 6-PACK — G-SPORT GEN1 ADVANCED HO CATALYTIC CONVERTERS, 3.000" This list...
View full detailsG-Sport Gen1 HO EPA Compliant Catalytic Converter 6 Pack - 2.500" Inlet/Outlet (650022)
Also available: Single unit (50022) | 6-Pack in 3.000" (650032) FABRICATOR 6-PACK — G-SPORT GEN1 ADVANCED HO CATALYTIC CONVERTERS, 2.500" This list...
View full detailsG-Sport OBD2 Non-EPA Compliant Catalytic Converter 6 Pack - 2.500" Inlet/Outlet (610025)
Also available: Single unit (10025) | 6-Pack in 3.000" (610030) FABRICATOR 6-PACK — G-SPORT OBD2 NON-EPA CATALYTIC CONVERTERS, 2.500" NOTE: These N...
View full detailsG-Sport OBD2 Non-EPA Compliant Catalytic Converter 6 Pack - 3.000" Inlet/Outlet (610030)
Also available: Single unit (10030) | 6-Pack in 2.500" (610025) FABRICATOR 6-PACK — G-SPORT OBD2 NON-EPA CATALYTIC CONVERTERS, 3.000" NOTE: These N...
View full detailsG-Sport Gen1 HO EPA Compliant Catalytic Converter Core 6 Pack - 4.000" Body x 4.000" Long (650002)
Also available: Single core (50002) | UHO Core 6-Pack (685002) FABRICATOR 6-PACK — G-SPORT GEN1 ADVANCED HO CATALYTIC CONVERTER CORES, 4.000" BODY ...
View full details