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Shopping for 2018-Chevrolet-Impala
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Catalytic Converter

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Front Driver Catalytic Converter with Exhaust Manifold
A-Premium®
1-PC Catalytic Converter, Front Left Driver Side, Fit Federal Emissions, A-Premium APCCT273
4.4251 Reviews
$175.99
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3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront Left Driver Side
ColorNatural
Part interchange
641476, 674-048, 50549, 674048
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Front Right Catalytic Converter
A-Premium®
1-PC Catalytic Converter Front Right Passenger Side Fit Federal Emissions A-Premium APCCT535
$185.99
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3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront Right Passenger Side
ColorNatural
Part interchange
641477, 50550
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AP Emissions 608265 Catalytic Converter
AP Emissions
AP Emissions 608265 Catalytic Converter
$152.99
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3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Part interchange
608265
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AP Emissions 608706 Catalytic Converter
AP Emissions
AP Emissions 608706 Catalytic Converter
$204.99
Only 1 item left in stock
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3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Part interchange
608706
Show less
AP Emissions 641476 Catalytic Converter, Front Left Driver Side
AP Emissions
AP Emissions 641476 Catalytic Converter, Front Left Driver Side
$340.99
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3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront Left
Part interchange
641476
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AP Emissions 608416 Catalytic Converter
AP Emissions
AP Emissions 608416 Catalytic Converter
$148.99
Quantity Less than 5
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Part interchange
608416
Show less
AP Emissions 608736 Catalytic Converter
AP Emissions
AP Emissions 608736 Catalytic Converter
$261.99
Only 1 item left in stock
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Part interchange
608736
Show less
AP Emissions 608266 Catalytic Converter
AP Emissions
AP Emissions 608266 Catalytic Converter
$141.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Part interchange
608266
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Eastern Catalytic 50591 Catalytic Converter, Front Side
Eastern Catalytic
Eastern Catalytic 50591 Catalytic Converter, Front Side
$271.99
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3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront
Part interchange
50591
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Eastern Catalytic 50550 Catalytic Converter with Integrated Exhaust Manifold, Front Right Passenger Side
Eastern Catalytic
Eastern Catalytic 50550 Catalytic Converter with Integrated Exhaust Manifold, Front Right Passenger Side
$311.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront Right
Part interchange
50550
Show less
Eastern Catalytic 50549 Catalytic Converter with Integrated Exhaust Manifold, Front Left Driver Side
Eastern Catalytic
Eastern Catalytic 50549 Catalytic Converter with Integrated Exhaust Manifold, Front Left Driver Side
$357.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront Left
Part interchange
50549
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Eastern Catalytic 50551 Catalytic Converter, Rear Side
Eastern Catalytic
Eastern Catalytic 50551 Catalytic Converter, Rear Side
$409.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionRear
Part interchange
50551
Show less
Catalytic Converter - Walker 15034
Walker
Walker 15034 Catalytic Converter, Exhaust
$167.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionExhaust
Part interchange
15034, SC207, 602507, 6007, 602007, 70430, SC217, 6507
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Catalytic Converter - Walker 15039
Walker
Walker 15039 Catalytic Converter, Exhaust
$150.99
Quantity Less than 4
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionExhaust
Part interchange
15039, 602207, 94109, 83167, 6907, 93167, 70330, 94009, 
...View more
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Catalytic Converter - Walker 84206
Walker
Walker 84206 Catalytic Converter, Exhaust
$207.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionExhaust
Part interchange
84206, 551004, 755005
Show less
Catalytic Converter - Front Side - Walker 16788
Walker
Walker 16788 Catalytic Converter, Front Side
$298.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionFront
Part interchange
16788, 19612, 52889, 12627204, 12656263
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Catalytic Converter - Walker 15104
Walker
Walker 15104 Catalytic Converter, Exhaust
$269.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2018 Chevrolet Impala
Item LocatedUnited States
Quantity1
Installation PositionExhaust
Part interchange
15104, 641211, 92624, 82624
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!