AP Exhaust 644166 Catalytic Converter - Front Left
OE Quality 60-Day Returns
AP Exhaust
 Direct Fit Converter

AP Exhaust 644166 Catalytic Converter - Front Left

Brand AP Exhaust 644166
Position Front Left
Body Material Stainless steel
Inlet Gasket Qty 1
Inlet Hardware None
Inlet Type A 4 bolt welded
O2 Sensor Ports 2
Outlet Gasket Qty 1
Outlet Hardware Yes
Outlet Type A 2 bolt welded
Overall Length (IN) 17
Type Federal / epa direct-fit
Product line Direct Fit Converter
Fits Buick, Cadillac, Chevrolet, and GMC · 18 vehicles

Direct-fit design. Built to OE dimensions for application-specific exhaust replacement.

Stainless steel body. Helps resist corrosion in demanding exhaust environments.

Two O2 ports. Supports sensor placement for emissions-system operation.

Cross-references 84131556 for the same application. See all 1.

$363.17Free shipping
In stock · usually ships same day before 1pm CST
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Order total $363.17
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Catalytic Converter options

Direct-Fit Catalytic Converter

AP Exhaust 644166 is a direct-fit catalytic converter built to match OE dimensions and fitment for select applications. It uses a stainless steel body, two O2 sensor ports, and welded inlet and outlet connections for a precise exhaust-system match.

Compatible with Buick Enclave, Chevrolet Traverse, GMC Acadia, and Cadillac XT5 applications listed below, this Federal / EPA direct-fit converter is engineered for straightforward replacement where the original unit has failed or no longer meets emissions requirements. AP Exhaust 644166 is part of the Direct Fit Converter line, which focuses on OE-style dimensions and application-specific fitment.

Key Features

  • Federal / EPA direct-fit catalytic converter
  • Stainless steel body for exhaust-system durability
  • Two O2 sensor ports
  • 4-bolt welded inlet connection
  • 2-bolt welded outlet connection
  • Built to OE dimensions and fitment

Fitment Details

  • Fits 2021-2024 Buick Enclave, front left.
  • Fits 2021-2023 Chevrolet Traverse, front left.
  • Fits 2018-2020 Buick Enclave, front left.
  • Fits 2018-2020 Chevrolet Traverse, front left.
  • Fits 2017-2019 GMC Acadia, front left.
  • Fits 2017 Cadillac XT5, front left.
  • Fits 2017 GMC Acadia, front left.

What It Is Used For

  • Replacing a failed catalytic converter in the listed applications
  • Restoring exhaust flow and emissions-system function
  • Addressing converter efficiency-related fault conditions
  • Correcting fitment issues caused by a damaged or incorrect exhaust component

Installation Notes and Tips

Verify the vehicle’s emissions configuration before ordering, since this part is listed for Federal and California emissions applications with state restrictions noted in the fitment data. Confirm the inlet and outlet connection styles, O2 sensor port count, and front-left placement against the original unit before installation. AP Exhaust 644166 is a direct-fit replacement, but proper diagnosis of the emissions system should be completed before replacing the converter.

Quality Assurance

AP Exhaust states that its manufacturing process uses automated workstations, spinner welding equipment, and high-speed production lines to build converters to exact OE dimensions and fitment. The Direct Fit Converter line is positioned around application-specific replacement and consistent manufacturing control. This part cross-references Monroe Shocks & Struts (e.g., 84131556) for the same application.

Related reading

This part fits 18 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2024BuickEnclave3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2023BuickEnclave3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2023ChevroletTraverse3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2022BuickEnclave3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2022ChevroletTraverse3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2021BuickEnclave3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2021ChevroletTraverse3.6LV6Front LeftFederal and California Emissions; Direct Fit Converter
2020BuickEnclave3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2020ChevroletTraverse3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2019BuickEnclave3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2019ChevroletTraverse3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2019GMCAcadia3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2018BuickEnclave3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2018ChevroletTraverse3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2018GMCAcadia3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2017CadillacXT53.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2017GMCAcadia3.6LV6Front LeftDirect Fit; (2017); Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
2017GMCAcadia3.6LV6Front LeftDirect Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
84131556