AP Exhaust 641639 Catalytic Converter with Integrated Exhaust Manifold - Front
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AP Exhaust
 Direct Fit Converter w/ Manifold

AP Exhaust 641639 Catalytic Converter with Integrated Exhaust Manifold - Front

Brand AP Exhaust 641639
Position Front
Converter Type Federal / epa direct-fit
Inlet Quantity 1
Outlet Quantity 1
California Air Resources Board (CARB) Certified No
Overall Length 16.000
Inlet A Connection Type Welded flange
Inlet Gasket Quantity 1
Inlet Hardware Yes
Inlet Type A 4 bolt welded flange
Outlet A Connection Type Welded flange
Outlet Type A 2 bolt welded flange
Package Material Corrugated cardboard
Package Type Box
Product line Direct Fit Converter w/ Manifold
Fits Buick, Chevrolet, and GMC · 12 vehicles

Direct-fit design. Simplifies replacement with an OE-style exhaust connection layout.

Integrated manifold. Combines the converter and manifold in one assembly.

Welded flange connections. Supports a secure exhaust seal at both ends.

$362.00Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $362.00
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 with Integrated Exhaust Manifold options

Direct-Fit Exhaust Manifold Converter

AP Exhaust 641639 is a Federal / EPA direct-fit catalytic converter with integrated exhaust manifold for front applications. It is built for a welded-flange connection layout and matches the original-style exhaust routing used on supported vehicles.

Key Features

  • Federal / EPA direct-fit converter for straightforward replacement.
  • Integrated exhaust manifold design in a single assembly.
  • Welded flange inlet and outlet connections for a secure exhaust seal.
  • Includes inlet gasket and inlet hardware details listed in the product data.
  • Fits front applications on supported Buick, Chevrolet, and GMC models.

Detailed Description

This AP Exhaust catalytic converter with integrated exhaust manifold is engineered for vehicles that require a direct-fit emissions replacement. Part number 641639 is listed for 2018-2020 Buick Regal Sportback, 2018-2020 Buick Regal TourX, 2018-2020 Chevrolet Equinox, and 2018-2020 GMC Terrain, all in front position applications with Federal and California emissions notes shown in the fitment data. The welded 4-bolt inlet flange and welded 2-bolt outlet flange support an OE-style exhaust connection layout.

The Direct Fit Converter w/ Manifold line focuses on replacing the converter and manifold assembly as a matched unit, which helps simplify sourcing when the original design uses an integrated configuration. AP Exhaust 641639 is a practical choice for buyers searching for a catalytic converter with integrated exhaust manifold for a Chevrolet Equinox, GMC Terrain, or Buick Regal Sportback/TourX application.

What It Is Used For

  • Replacing a worn or failed catalytic converter assembly.
  • Restoring proper exhaust flow through an integrated manifold design.
  • Addressing exhaust leaks at welded flange connection points.
  • Serving front-position emissions repair needs on supported vehicles.
  • Matching direct-fit replacement requirements for listed applications.

Installation Notes and Tips

Verify the vehicle’s emissions configuration and compare the existing flange style before installation. This part uses welded flange connections and is listed with inlet hardware and an inlet gasket in the product attributes. Confirm fitment by year, make, model, and position before ordering AP Exhaust 641639.

Quality Assurance

AP Exhaust 641639 is a Federal / EPA direct-fit converter, and the product line is positioned as a direct-fit replacement solution for integrated manifold applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Related reading

This part fits 12 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2020BuickRegal Sportback2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2020BuickRegal TourX2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2020ChevroletEquinox2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2020GMCTerrain2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2019BuickRegal Sportback2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2019BuickRegal TourX2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2019ChevroletEquinox2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2019GMCTerrain2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2018BuickRegal Sportback2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2018BuickRegal TourX2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2018ChevroletEquinox2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold
2018GMCTerrain2.0LL4FrontFederal and California Emissions; Direct Fit Converter w/ Manifold