AP Exhaust 643135 Catalytic Converter - Center
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AP Exhaust

AP Exhaust 643135 Catalytic Converter - Center

Brand AP Exhaust 643135
Position Center
Body Material Stainless steel
Inlet Gasket 2
Inlet Gasket Yes
Inlet Hardware None
Inlet Type A 2 bolt welded flange
Inlet Type B 2 bolt welded flange
O2 Sensor Ports 1
Outlet Gasket Yes
Outlet Hardware None
Outlet Type A 2 bolt welded flange
Overall Length (IN) 54.63
Substrate Material Ceramic
Type Federal / epa direct-fit
Fits Buick · 15 vehicles

Federal / EPA direct-fit. Built to exact OE dimensions for straightforward installation.

Stainless steel body. Helps resist corrosion for longer service life.

Ceramic substrate. Supports efficient converter performance.

$478.27Free shipping
In stock · usually ships same day before 1pm CST
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Order total $478.27
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Free returns within 60 days if it doesn't fit when fitment is verified.
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AP Exhaust 643135 Catalytic Converter

AP Exhaust 643135 is a Federal / EPA direct-fit catalytic converter built for exact OE dimensions and fitment. It uses a ceramic substrate and stainless steel body construction to support efficient exhaust flow and emissions control on select Buick applications.

Key Features

  • Federal / EPA direct-fit catalytic converter
  • Ceramic substrate material for emissions conversion
  • Stainless steel body material
  • 2-bolt welded flange inlet and outlet connections
  • 1 O2 sensor port
  • Overall length: 54.63 in.
  • Direct-fit design for OE-style installation

Detailed Description

AP Exhaust 643135 is engineered for select 2010-2016 Buick LaCrosse and 2010 Buick Allure applications, including center-position configurations listed in the fitment data. The converter is built with automated manufacturing processes to maintain OE dimensions, helping ensure proper alignment with the exhaust system. For buyers searching for a 2013-2016 Buick LaCrosse center catalytic converter or a 2010-2012 Buick LaCrosse direct-fit catalytic converter, this part number provides a vehicle-specific replacement option. AP Exhaust 643135 also appears in searches for Buick LaCrosse exhaust emissions repair and Buick Allure catalytic converter replacement.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

  • Failed catalytic converter efficiency codes
  • Restricted exhaust flow from a worn converter
  • Emissions test failures related to converter performance
  • Check engine lights tied to catalyst monitoring faults
  • Replacement needs after exhaust system corrosion or damage

Installation Notes and Tips

Verify the vehicle’s emissions package before ordering. This converter is listed for Federal and California emissions on the covered Buick applications, with exclusions for PZEV vehicles and restrictions noted for CA, CO, ME, and NY. Confirm the inlet and outlet flange style, O2 sensor port location, and overall length against the original part before installation. Professional installation is recommended to ensure proper sealing and sensor placement.

Quality Assurance

AP Exhaust uses proprietary substrate chemistry and modern production methods to build converters to OE dimensions and fitment standards. The manufacturing approach is focused on consistent efficiency, productivity, and competitive pricing for direct-fit emissions replacement.

Related reading

This part fits 15 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelDrive TypeLitersCylindersPositionNotes
2016BuickLaCrosseFWD3.6LV6CenterDirect Fit; Exc. PZEV Emissions; 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.
2015BuickLaCrosseFWD3.6LV6CenterDirect Fit; Exc. PZEV Emissions; 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.
2014BuickLaCrosseFWD3.6LV6N/ADirect Fit; (Exc. PZEV); 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.
2014BuickLaCrosseFWD3.6LV6CenterDirect Fit; Exc. PZEV Emissions; 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.
2013BuickLaCrosseFWD3.6LV6N/ADirect Fit; (Exc. PZEV); 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.
2013BuickLaCrosseFWD3.6LV6CenterDirect Fit; Exc. PZEV Emissions; 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.
2012BuickLaCrosseFWD3.6LV6N/ADirect Fit; (10-12); 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.
2012BuickLaCrosseFWD3.6LV6CenterDirect 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.
2011BuickLaCrosseFWD3.6LV6N/ADirect Fit; (10-12); 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.
2011BuickLaCrosseFWD3.6LV6CenterDirect 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.
2010BuickAllure—3.0LV6CenterDirect 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.
2010BuickAllure—3.6LV6CenterDirect 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.
2010BuickLaCrosseFWD3.6LV6N/ADirect Fit; (10-12); 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.
2010BuickLaCrosseFWD3.0LV6CenterDirect 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.
2010BuickLaCrosseFWD3.6LV6CenterDirect 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.