with Federal/California Emissions System Not legal for sale or use in California and other CARB-compliant states. Legal in Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details. Ultra Universal Type Modifications and/or Additional Parts May Be Required for Installation
Not legal for use in California Illegal for installation in NY on vehicles equipped with California emission systems
Not legal for use in California Illegal for installation in NY on vehicles equipped with California emission systems Except HO
Direct Fit Federal, 47-State Only, Not legal for sale in CA, NY or ME
Direct Fit Federal, 47-State Only, Not legal for sale in CA, NY or ME
Not legal for use in California Illegal for installation in NY on vehicles equipped with California emission systems
Direct Fit
Direct Fit
Direct Fit; Not for sale or use on vehicles licensed in the states of CA, CO, ME, and NY. Restrictions may apply in other states. Check with your state authority for details. Federal and California Emissions
Undercar Legal Note: Not For Sale or Use in the State of CA, CO, ME & NY (vehicles with CA Emissions)
Undercar Legal Note: Not For Sale or Use in the State of CA, CO, ME & NY (vehicles with CA Emissions)
Not legal for use in California Illegal for installation in NY on vehicles equipped with California emission systems Manifold Converter
Not legal for use in California Illegal for installation in NY on vehicles equipped with California emission systems Manifold Converter
CARB Executive Order D-182-75 Engine Family Number (EFN) 6GMXB03.6149 Legal for sale and use in California and other states requiring CARB-compliant replacement converters. Consult the aftermarket converter regulations in your state for details. Modifications and/or Additional Parts May Be Required for Installation Universal Type
Not legal for sale or installation in California, Colorado or New York.
Not legal for sale or installation in California, Colorado or New York.
Undercar Legal Note: Not For Sale or Use in the State of CA, CO, ME & NY (vehicles with CA Emissions)
Undercar Legal Note: Not For Sale or Use in the State of CA, CO, ME & NY (vehicles with CA Emissions)
Not legal for sale or installation in California, Colorado or New York.
Not legal for sale or installation in California, Colorado or New York.
Not legal for sale or installation in California, Colorado or New York.
Not legal for sale or installation in California, Colorado or New York.
770 Series Engine Family Number (EFN) 8GMXV03.6053 CARB Executive Order D-798-10 ; Direct Fit - CARB ALL
770 Series Engine Family Number (EFN) 8GMXV03.6053 CARB Executive Order D-798-10 ; Direct Fit - CARB ALL
CARB Executive Order D-193-140 Engine Family Number (EFN) 6GMXB03.6149 Legal For Sale In All 50 States Including California, Colorado and New York (CARB Certified)
CARB Executive Order D-193-140 Engine Family Number (EFN) 6GMXB03.6149 Cutting and Welding Required Legal For Sale In All 50 States Including California, Colorado and New York (CARB Certified)
CARB Executive Order D-193-140 Engine Family Number (EFN) 6GMXB03.6149
CARB Executive Order D-193-140 Engine Family Number (EFN) 6GMXB03.6149 Cutting and Welding Required
CARB Executive Order D-193-140 Engine Family Number (EFN) 8GMXV03.6053
CARB Executive Order D-193-140 Engine Family Number (EFN) 8GMXV03.6053 Cutting and Welding Required
CARB Executive Order D-193-140 Engine Family Number (EFN) 8GMXV03.6053 Legal For Sale In All 50 States Including California, Colorado and New York (CARB Certified)
CARB Executive Order D-193-140 Engine Family Number (EFN) 8GMXV03.6053 Cutting and Welding Required Legal For Sale In All 50 States Including California, Colorado and New York (CARB Certified)
CARB Executive Order D-193-140 Engine Family Number (EFN) 6GMXB03.6149
CARB Executive Order D-193-140 Engine Family Number (EFN) 6GMXB03.6149 Legal For Sale In All 50 States Including California, Colorado and New York (CARB Certified)
CARB Executive Order D-193-140 Engine Family Number (EFN) 8GMXV03.6053
CARB Executive Order D-193-140 Engine Family Number (EFN) 8GMXV03.6053 Legal For Sale In All 50 States Including California, Colorado and New York (CARB Certified)
Browse our selection of quality catalytic converter parts designed specifically for your Cadillac STS. We carry options across multiple trim levels, body styles, and engine configurations to ensure a perfect fit.
Base · Elegance · Platinum · V
Sedan
V6 3.6L · V8 4.4L · V8 4.6L
Automatic
