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Shopping for 2008-Cadillac-STS
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Catalytic Converter

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1pc Catalytic Converter, Left Driver Side, Fit Federal Emissions, A-Premium APCCT031
A-Premium®Part # APCCT031
1pc Catalytic Converter, Left Driver Side, Fit Federal Emissions, A-Premium APCCT031
4.618 Reviews
$260.99
CA$274.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Fits 2008 - 2011 Cadillac CTS, 2008 - 2011 Cadillac STS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2008 Cadillac STS
Item LocatedCanada
Quantity1
Installation PositionLeft Driver Side
ColorNatural
Part interchange
16685, 25971634
item #10055AWY
Note
【Note-1】 EPA Compliant -- Suitable for use on OBDII vehicles from 1996 and newer. This product is not legal for sale or use in CA/NY/CO/ME due to state emissions regulations. We do not ship it to these states. This product is compatible with Federal Emissions standards. For California Emissions Standards, please check the state's aftermarket converter regulations.
【Note-2】 This item fits for the vehicle with V6 3.6L engine only.
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1pc Catalytic Converter, Left Driver Side, Fit Federal Emissions, A-Premium APCCT167
A-Premium®Part # APCCT167
1pc Catalytic Converter, Left Driver Side, Fit Federal Emissions, A-Premium APCCT167
4.618 Reviews
$286.99
CA$302.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Fits 2004 - 2009 Cadillac SRX, 2005 - 2010 Cadillac STS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2008 Cadillac STS
Item LocatedCanada
Quantity1
Installation PositionLeft Driver Side
ColorNatural
Part interchange
674-931, 12567688, 12607451, 12638982, 16622, 101488
item #100558YR
Note
【Note-1】 EPA Compliant -- Suitable for use on OBDII vehicles from 1996 and newer. This product is not legal for sale or use in CA/NY/CO/ME due to state emissions regulations. We do not ship it to these states. This product is compatible with Federal Emissions standards. For California Emissions Standards, please check the state's aftermarket converter regulations.
【Note-2】 This item fits for the vehicle with V8 4.6L engine only.
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2pc Catalytic Converter, Driver & Passenger, Fit Federal Emissions, A-Premium APCCT030
A-Premium®Part # APCCT030
2pc Catalytic Converter, Driver & Passenger, Fit Federal Emissions, A-Premium APCCT030
4.618 Reviews
$486.99
CA$512.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Fits 2008 - 2011 Cadillac STS, 2008 - 2011 Cadillac CTS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2008 Cadillac STS
Item LocatedCanada
Quantity2
Installation PositionDriver & Passenger
ColorNatural
Part interchange
16685, 25971634, 16684, 25939989
item #10055L8H
Note
EPA Compliant -- Suitable for use on OBDII vehicles from 1996 and newer. This product is not legal for sale or use in CA/NY/CO/ME due to state emissions regulations. We do not ship it to these states. This product is compatible with Federal Emissions standards. For California Emissions Standards, please check the state's aftermarket converter regulations.
Show less
2pc Catalytic Converter, Driver & Passenger, Fit Federal Emissions, A-Premium APCCT165
A-Premium®Part # APCCT165
2pc Catalytic Converter, Driver & Passenger, Fit Federal Emissions, A-Premium APCCT165
4.618 Reviews
$623.99
CA$656.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Fits 2004 - 2009 Cadillac SRX, 2005 - 2010 Cadillac STS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2008 Cadillac STS
Item LocatedCanada
Quantity2
Installation PositionDriver & Passenger
ColorNatural
Part interchange
674-931, 12567688, 12607451, 12638982, 16622, 101488, 674-930, 12567687, 
...View more
item #10055QRG
Note
【Note-1】 EPA Compliant -- Suitable for use on OBDII vehicles from 1996 and newer. This product is not legal for sale or use in CA/NY/CO/ME due to state emissions regulations. We do not ship it to these states. This product is compatible with Federal Emissions standards. For California Emissions Standards, please check the state's aftermarket converter regulations.
【Note-2】 This item only fits models with the V8 4.6L engine, Not with the V6 3.6L one.
Show less
1pc Catalytic Converter, Right Passenger Side, Fit Federal Emissions, A-Premium APCCT029
A-Premium®Part # APCCT029
1pc Catalytic Converter, Right Passenger Side, Fit Federal Emissions, A-Premium APCCT029
4.618 Reviews
$265.99
CA$279.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Fits 2008 - 2011 Cadillac CTS, 2008 - 2011 Cadillac STS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2008 Cadillac STS
Item LocatedCanada
Quantity1
Installation PositionRight Passenger Side
ColorNatural
Part interchange
16684, 25939989
item #10055ANZ
Note
EPA Compliant -- Suitable for use on OBDII vehicles from 1996 and newer. This product is not legal for sale or use in CA/NY/CO/ME due to state emissions regulations. We do not ship it to these states. This product is compatible with Federal Emissions standards. For California Emissions Standards, please check the state's aftermarket converter regulations.
Show less
1pc Catalytic Converter, Right Passenger Side, Fit Federal Emissions, A-Premium APCCT166
A-Premium®Part # APCCT166
1pc Catalytic Converter, Right Passenger Side, Fit Federal Emissions, A-Premium APCCT166
4.618 Reviews
$286.99
CA$302.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Fits 2004 - 2009 Cadillac SRX, 2005 - 2010 Cadillac STS
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2008 Cadillac STS
Item LocatedCanada
Quantity1
Installation PositionRight Passenger Side
ColorNatural
Part interchange
674-930, 12567687, 12607450, 12638981, 101487
item #10055C20
Note
【Note-1】 EPA Compliant -- Suitable for use on OBDII vehicles from 1996 and newer. This product is not legal for sale or use in CA/NY/CO/ME due to state emissions regulations. We do not ship it to these states. This product is compatible with Federal Emissions standards. For California Emissions Standards, please check the state's aftermarket converter regulations.
【Note-2】 This item fits for the vehicle with V8 4.6L engine only.
Show less

A catalytic converter, often referred to as a "cat," is an essential component of your engine's exhaust system. This device uses catalysts to transform harmful chemicals in the exhaust gases.

What are the signs of a bad catalytic converter?

  • Check engine light
    The dashboard warning light may illuminate, indicating potential issues.
  • Decreased engine performance
    Noticeable loss of power, acceleration, or overall engine performance.
  • Poor fuel economy
    A significant drop in fuel efficiency can occur as the converter fails.
  • Excessive exhaust emissions
    Increased emissions, including a strong sulfur or rotten egg smell.
  • Rattling noises
    Unusual rattling sounds from the exhaust system, indicating internal damage.
  • Overheating
    The engine may run hotter than normal due to restricted exhaust flow.
  • Failed emissions test
    Inability to pass emissions testing due to high pollution levels.

Shop for aftermarket catalytic converters on A-Premium.com

Premium.com offers a wide range of aftermarket catalytic converters for your vehicle. Refine your search by selecting from various dimensions, inlet types, and tube materials. A-Premium team is dedicated to helping you find a compatible catalytic converter for your car. Every item in our catalog is carefully selected by our team of experts, ensuring they undergo rigorous quality checks to endure the demanding conditions of your exhaust system. Shop now to find the best deal on your new catalytic converter!