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AP Exhaust 645288 Catalytic Converter

Brand	AP Exhaust 645288
Body Material	Stainless steel
Inlet Gasket	Yes
Inlet Hardware	None
Inlet Type A	4 bolt welded flange
O2 Sensor Ports	None
Outlet Gasket	Not required
Outlet Hardware	None
Outlet Type A	2.57" od pipe
Overall Length (IN)	20
Substrate Material	Ceramic
Type	Federal / epa direct-fit
Fits	Buick, Cadillac, and Pontiac · 51 vehicles

Direct-fit replacement. Built to exact OE dimensions for straightforward installation.

Stainless steel body. Helps resist corrosion for long-term durability.

Ceramic substrate. Supports efficient converter performance.

$337.63Free shipping

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Direct-Fit Catalytic Converter for GM Full-Size Sedans

AP Exhaust 645288 is a Federal / EPA direct-fit catalytic converter built for OE-style replacement on select Buick, Cadillac, and Pontiac applications. It uses a stainless steel body with a ceramic substrate and is built to OE dimensions for proper fitment on the listed vehicles.

Compatible With 1997-2005 Buick Park Avenue, 2000-2005 Buick LeSabre, 2000-2005 Cadillac DeVille, and 2000-2005 Pontiac Bonneville applications, this converter is a practical choice when replacing a worn or restricted emissions component. AP Exhaust 645288 is engineered for direct-fit installation on the listed exhaust layouts, including configurations that require cutting or aftermarket pipe adaptation.

Key Features

Federal / EPA direct-fit catalytic converter
Stainless steel body for corrosion resistance
Ceramic substrate material
4-bolt welded flange inlet
2.57" OD pipe outlet
Overall length: 20 inches
Inlet gasket included; outlet gasket not required
No O2 sensor ports

Fitment Details

Fits 2000-2005 Buick LeSabre, N/A — Direct Fit; Conv. Only; Cut as required; Federal and California Emissions; Single Exhaust.
Fits 2000-2005 Buick LeSabre, N/A — Direct Fit; Federal and California Emissions.
Fits 1997-2005 Buick Park Avenue, N/A — Direct Fit; 00-05; Federal and California Emissions; Cut as required.
Fits 2000-2005 Buick Park Avenue, N/A — Direct Fit; For use with aftermarket pipes; additional sizing, bushings, and cutting may be required; Federal and California Emissions.
Fits 2000-2005 Cadillac DeVille, N/A — Direct Fit; Use with aftermarket center pipe; OE system was a welded assembly; cut as required; Federal and California Emissions; Dual Exhaust, chrome tip applications.
Fits 2000-2005 Cadillac DeVille, N/A — Direct Fit; For use with aftermarket pipes; additional sizing, bushings, and cutting may be required; Federal and California Emissions.
Fits 2000-2005 Pontiac Bonneville, N/A — Direct Fit; Use with aftermarket components; cut as required; Federal and California Emissions; Single Exhaust.
Fits 2000-2005 Pontiac Bonneville, N/A — Direct Fit; For use with aftermarket pipes; additional sizing, bushings, and cutting may be required; Federal and California Emissions.

What This Converter Helps Address

Failed emissions testing caused by a worn catalytic converter
Restricted exhaust flow from a deteriorated substrate
Check engine light concerns related to converter efficiency
Exhaust leaks at the converter connection points
Fitment issues when replacing an OE welded assembly with serviceable parts

Installation Notes and Tips

Review the vehicle-specific notes before installation, since some applications require cutting, aftermarket center pipes, or additional sizing and bushings. This part uses a 4-bolt welded flange inlet and a 2.57" OD pipe outlet, so confirm the exhaust connection style before ordering. For Cadillac DeVille applications, the OE system was a welded assembly and replacement of related exhaust components may be required for proper service fit.

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

Quality Assurance

AP Exhaust uses proprietary substrate chemistry and advanced manufacturing processes, including automated workstations, spinner welding equipment, and high-speed production lines, to build converters to exact OE dimensions and fitment. That production approach supports consistent construction and competitive replacement value for the listed Buick, Cadillac, and Pontiac applications.

This part fits 51 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Liters	Cylinders	Notes
2005	Buick	LeSabre	3.8L	V6	Direct Fit; (Conv. Only); Cut as required.; 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.; Single Exhaust
2005	Buick	LeSabre	3.8L	V6	Direct 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.
2005	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
2005	Buick	Park Avenue	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2005	Cadillac	DeVille	4.6L	V8	Direct Fit; (Use w/ Aftermarket Center Pipe); OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; 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.; Cut as required.; Dual Exhaust, chrome tip applications
2005	Cadillac	DeVille	4.6L	V8	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2005	Pontiac	Bonneville	3.8L	V6	Direct Fit; (Use With Aftermarket Components); Cut as required.; 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.; Single Exhaust
2005	Pontiac	Bonneville	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2004	Buick	LeSabre	3.8L	V6	Direct Fit; (Conv. Only); Cut as required.; 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.; Single Exhaust
2004	Buick	LeSabre	3.8L	V6	Direct 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.
2004	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
2004	Buick	Park Avenue	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2004	Cadillac	DeVille	4.6L	V8	Direct Fit; (Use w/ Aftermarket Center Pipe); OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; 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.; Cut as required.; Dual Exhaust, chrome tip applications
2004	Cadillac	DeVille	4.6L	V8	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2004	Pontiac	Bonneville	3.8L	V6	Direct Fit; (Use With Aftermarket Components); Cut as required.; 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.; Single Exhaust
2004	Pontiac	Bonneville	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2003	Buick	LeSabre	3.8L	V6	Direct Fit; (Conv. Only); Cut as required.; 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.; Single Exhaust
2003	Buick	LeSabre	3.8L	V6	Direct 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.
2003	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
2003	Buick	Park Avenue	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2003	Cadillac	DeVille	4.6L	V8	Direct Fit; (Use w/ Aftermarket Center Pipe); OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; 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.; Cut as required.; Dual Exhaust, chrome tip applications
2003	Cadillac	DeVille	4.6L	V8	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2003	Pontiac	Bonneville	3.8L	V6	Direct Fit; (Use With Aftermarket Components); Cut as required.; 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.; Single Exhaust
2003	Pontiac	Bonneville	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2002	Buick	LeSabre	3.8L	V6	Direct Fit; (Conv. Only); Cut as required.; 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.; Single Exhaust
2002	Buick	LeSabre	3.8L	V6	Direct 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.
2002	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
2002	Buick	Park Avenue	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2002	Cadillac	DeVille	4.6L	V8	Direct Fit; (Use w/ Aftermarket Center Pipe); OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; 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.; Cut as required.; Dual Exhaust, chrome tip applications
2002	Cadillac	DeVille	4.6L	V8	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2002	Pontiac	Bonneville	3.8L	V6	Direct Fit; (Use With Aftermarket Components); Cut as required.; 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.; Single Exhaust
2002	Pontiac	Bonneville	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2001	Buick	LeSabre	3.8L	V6	Direct Fit; (Conv. Only); Cut as required.; 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.; Single Exhaust
2001	Buick	LeSabre	3.8L	V6	Direct 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.
2001	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
2001	Buick	Park Avenue	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2001	Cadillac	DeVille	4.6L	V8	Direct Fit; (Use w/ Aftermarket Center Pipe); OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; 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.; Cut as required.; Dual Exhaust, chrome tip applications
2001	Cadillac	DeVille	4.6L	V8	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2001	Pontiac	Bonneville	3.8L	V6	Direct Fit; (Use With Aftermarket Components); Cut as required.; 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.; Single Exhaust
2001	Pontiac	Bonneville	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2000	Buick	LeSabre	3.8L	V6	Direct Fit; (Conv. Only); Cut as required.; 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.; Single Exhaust
2000	Buick	LeSabre	3.8L	V6	Direct 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.
2000	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
2000	Buick	Park Avenue	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2000	Cadillac	DeVille	4.6L	V8	Direct Fit; (Use w/ Aftermarket Center Pipe); OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; 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.; Cut as required.; Dual Exhaust, chrome tip applications
2000	Cadillac	DeVille	4.6L	V8	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
2000	Pontiac	Bonneville	3.8L	V6	Direct Fit; (Use With Aftermarket Components); Cut as required.; 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.; Single Exhaust
2000	Pontiac	Bonneville	3.8L	V6	Direct Fit; For use with Aftermarket pipes, additional sizing, bushings, cutting may be required due to OE exhaust design.; 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.
1999	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
1998	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
1997	Buick	Park Avenue	3.8L	V6	Direct Fit; (00-05); 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.; Cut as required.
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