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🎄 Ace Race Parts will be closed from December 24th through December 26th for the Christmas holiday. Orders will be processed on December 23rd and December 27th in the order they are received. Expedited shipping orders are guaranteed to ship out if placed before the same-day shipping cutoff time (12 PM Pacific). Wishing you a Merry Christmas and Happy Holidays! 🎄
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Catalytic Converters

Catalytic Converters are available from brands like G-Sport (by GESI) and MagnaFlow Performance and are available in configurations like core/substrate only and complete catalytic converters with transition cone end caps. All G-Sport catalytic converters are EPA compliant. NOTE: None of the Catalytic Converters listed on this site are CARB compliant and are... Read More
G-Sport GESI HO 2.500" Inlet/Outlet Gen1 EPA Compliant Catalytic Converter 300 CPSI (50025) - Ace Race Parts

G-Sport Gen1 HO EPA Compliant Catalytic Converter - 2.500" Inlet/Outlet (50022)

SKU GSP50022
$ 614.10 - $ 614.10
$ 614.10
$ 614.10 - $ 614.10
$ 614.10
Only 3 left!

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's co...

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G-Sport GESI UHO 3.000" Inlet/Outlet Gen1 EPA Compliant Catalytic Converter 300 CPSI (85030) - Ace Race Parts Sold out

G-Sport Gen1 UHO EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (85032)

SKU GSP85032
$ 733.01 - $ 733.01
$ 733.01
$ 733.01 - $ 733.01
$ 733.01
Out of stock

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's co...

View full details
G-Sport GESI Gen2 EPA Compliant Catalytic Converter Core - 4.000" Body x 4.000" Long - 400 CPSI (50200) - Ace Race Parts

G-Sport Gen2 EPA Compliant Catalytic Converter Core - 4.000" Body x 4.000" Long (50200)

SKU GSP50200
$ 600.56 - $ 600.56
$ 600.56
$ 600.56 - $ 600.56
$ 600.56
Only 1 left!

GESI G-Sport part number 50200 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

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G-Sport GESI Gen2 EPA Compliant Catalytic Converter Core - 4.500" Body x 4.000" Long - 400 CPSI (85200) - Ace Race Parts

G-Sport Gen2 EPA Compliant Catalytic Converter Core - 4.500" Body x 4.000" Long (85200)

SKU GSP85200
$ 710.43 - $ 710.43
$ 710.43
$ 710.43 - $ 710.43
$ 710.43
Only 1 left!

GESI G-Sport part number 85200 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

View full details
G-Sport GESI Gen2 EPA Compliant Catalytic Converter Core - 5.000" Body x 4.000" Long - 400 CPSI (85500) - Ace Race Parts

G-Sport Gen2 EPA Compliant Catalytic Converter Core - 5.000" Body x 4.000" Long (85500)

SKU GSP85500
$ 835.36 - $ 835.36
$ 835.36
$ 835.36 - $ 835.36
$ 835.36
Only 1 left!

GESI G-Sport part number 85500 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

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G-Sport Gen2 EPA Compliant Catalytic Converter Core - 5.000" Body x 7.000" Long - Mid-Bed Series (25001)

SKU GSP25001
$ 1,092.66 - $ 1,092.66
$ 1,092.66
$ 1,092.66 - $ 1,092.66
$ 1,092.66
Only 2 left!

GESI G-Sport part number 25001 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

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G-Sport GESI Gen2 EPA Compliant Catalytic Converter Core - 6.000" Body x 4.000" Long - 400 CPSI (85600) - Ace Race Parts

G-Sport Gen2 EPA Compliant Catalytic Converter Core - 6.000" Body x 4.000" Long (85600)

SKU GSP85600
$ 1,041.57 - $ 1,041.57
$ 1,041.57
$ 1,041.57 - $ 1,041.57
$ 1,041.57
Only 2 left!

GESI G-Sport part number 85600 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

View full details
G-Sport GESI HO 3.000" Inlet/Outlet Gen1 EPA Compliant Catalytic Converter 300 CPSI (50030) - Ace Race Parts

G-Sport HO Gen1 EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (50032)

SKU GSP50032
$ 626.15 - $ 626.15
$ 626.15
$ 626.15 - $ 626.15
$ 626.15
Only 1 left!

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's co...

View full details
G-Sport GESI Gen1 EPA Compliant Catalytic Converter Core - 4.000" Body x 4.000" Long - 300 CPSI (50000) - Ace Race Parts

G-Sport HO Gen1 EPA Compliant Catalytic Converter Core - 4.000" Body x 4.000" Long (50002)

SKU GSP50002
$ 600.56 - $ 600.56
$ 600.56
$ 600.56 - $ 600.56
$ 600.56
Only 1 left!

GESI G-Sport part number 50000 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

View full details
G-Sport GESI HO 2.500" Inlet/Outlet Gen1 EPA Compliant Catalytic Converter 400 CPSI (50225) - Ace Race Parts
Sold out

G-Sport HO Gen2 EPA Compliant - 2.500" Inlet/Outlet Catalytic Converter (50225)

SKU GSP50225
$ 614.10 - $ 614.10
$ 614.10
$ 614.10 - $ 614.10
$ 614.10
Out of stock

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's co...

View full details
G-Sport GESI HO 2.500" Inlet/Outlet Gen1 EPA Compliant Catalytic Converter 400 CPSI (50225) - Ace Race Parts
Sold out

G-Sport HO Gen2 EPA Compliant - 3.000" Inlet/Outlet Catalytic Converter (50230)

SKU GSP50230
$ 626.15 - $ 626.15
$ 626.15
$ 626.15 - $ 626.15
$ 626.15
Out of stock

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's co...

View full details
G-Sport GESI Transition Cone For 4.000" OD Body Catalytic Converters - 2.500" Inlet/Outlet (94025) - Ace Race Parts

G-Sport Transition Cone For 4.000" OD Body Catalytic Converters - 2.500" Inlet/Outlet (94025)

SKU GSP94025
$ 29.69 - $ 29.69
$ 29.69
$ 29.69 - $ 29.69
$ 29.69
Only 2 left!

GESI's universal line of G-Sport Catalytic Converter Transition Cones create a smooth transition between G-Sport Catalytic Cores. This specific Tra...

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G-Sport GESI Transition Cone For 4.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (94030) - Ace Race Parts
Sold out

G-Sport Transition Cone For 4.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (94030)

SKU GSP94030
$ 26.69 - $ 26.69
$ 26.69
$ 26.69 - $ 26.69
$ 26.69
Out of stock

GESI's universal line of G-Sport Catalytic Converter Transition Cones create a smooth transition between G-Sport Catalytic Cores. This specific Tra...

View full details
G-Sport GESI Transition Cone For 4.500" OD Body Catalytic Converters - 3.000" Inlet/Outlet (94530) - Ace Race Parts

G-Sport Transition Cone For 4.500" OD Body Catalytic Converters - 3.000" Inlet/Outlet (94530)

SKU GSP94530
$ 49.49 - $ 49.49
$ 49.49
$ 49.49 - $ 49.49
$ 49.49
Only 2 left!

GESI's universal line of G-Sport Catalytic Converter Transition Cones create a smooth transition between G-Sport Catalytic Cores. This specific Tra...

View full details
G-Sport GESI Transition Cone For 5.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (95530) - Ace Race Parts

G-Sport Transition Cone For 5.000" OD Body Catalytic Converters - 3.000" Inlet/Outlet (95530)

SKU GSP95530
$ 49.49 - $ 49.49
$ 49.49
$ 49.49 - $ 49.49
$ 49.49
Only 1 left!

GESI's universal line of G-Sport Catalytic Converter Transition Cones create a smooth transition between G-Sport Catalytic Cores. This specific Tra...

View full details
G-Sport GESI Gen1 EPA Compliant Catalytic Converter Core - 4.500" Body x 4.000" Long - 300 CPSI (85000) - Ace Race Parts

G-Sport UHO Gen1 EPA Compliant Catalytic Converter Core - 4.500" Body x 4.000" Long (85002)

SKU GSP85002
$ 710.43 - $ 710.43
$ 710.43
$ 710.43 - $ 710.43
$ 710.43
Only 1 left!

GESI G-Sport part number 85000 is ONLY the Catalytic Core. G-Sport Transition Cones are sold separately. GESI's universal line of G-Sport Emissions...

View full details
Ace Race Parts | G-Sport 85240 - GESI 400 CPSI GEN 2 EPA Approved 4.0in Inlet/Outlet Catalytic Converter
Sold out

G-Sport UHO Gen2 EPA Compliant Catalytic Converter - 3.000" Inlet/Outlet (85230)

SKU GSP85230
$ 733.01 - $ 733.01
$ 733.01
$ 733.01 - $ 733.01
$ 733.01
Out of stock

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's co...

View full details
Ace Race Parts | G-Sport 85240 - GESI 400 CPSI GEN 2 EPA Approved 4.0in Inlet/Outlet Catalytic Converter
Sold out

G-Sport UHO Gen2 EPA Compliant Catalytic Converter - 4.000" Inlet/Outlet (85240)

SKU GSP85240
$ 749.57 - $ 749.57
$ 749.57
$ 749.57 - $ 749.57
$ 749.57
Out of stock

GESI's universal line of G-Sport Emissions Systems Catalytic Converters are designed to support the growing high performance aftermarket. GESI's 40...

View full details