AP Exhaust 645864 Catalytic Converter

Name: AP Exhaust 645864 Catalytic Converter
Brand: AP Exhaust
SKU: BBDL-645864
Price: 261.45 USD
Availability: InStock

⚙️ 20 vehicles fit this part

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✅OE Direct Replacement — Bolt-on fit, no modifications needed

🚗Fitment: Buick, Chevrolet, GMC, Isuzu, and Saab, 9-7x, Ascender, Envoy, Rainier, and Trailblazer

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Reliable Catalytic Converter for Buick, Chevrolet, GMC, Isuzu, and Saab

The AP Exhaust catalytic converter 645864 is designed to meet federal EPA standards for direct-fit replacement. Engineered with durable stainless steel and a ceramic substrate, this catalytic converter ensures efficient emission control for select Buick, Chevrolet, GMC, Isuzu, and Saab models.

Constructed from corrosion-resistant stainless steel body
Includes inlet and outlet gaskets for secure sealing
Features one O2 sensor port for accurate emissions monitoring
Inlet: 3 bolt loose flange with flare design
Outlet: 2 bolt welded flange for reliable connection
Overall length of 48.13 inches for precise fitment
Federal/EPA direct-fit catalytic converter compliant
Ceramic substrate for effective pollutant conversion

Durable Construction and Precise Fitment

This AP Exhaust catalytic converter 645864 is built with a stainless steel body that resists rust and corrosion, extending the life of your exhaust system. The ceramic substrate inside efficiently converts harmful emissions into less toxic gases, helping your vehicle meet environmental regulations. Designed with a 3 bolt loose flange inlet and a 2 bolt welded flange outlet, it provides a secure and leak-free connection. The inclusion of one O2 sensor port allows for proper sensor installation, maintaining engine performance and emission control.

Compatible Vehicle Models

This catalytic converter is compatible with various models including Buick 9-7x, Chevrolet Trailblazer, GMC Envoy, Isuzu Ascender, and Saab Rainier. The direct-fit design ensures straightforward installation without the need for modifications, making it suitable for owners seeking a reliable replacement part.

Common Applications and Issues Addressed

Replacement for damaged or clogged catalytic converters
Restores proper exhaust flow and reduces emissions
Resolves check engine light issues related to catalytic converter failure
Improves vehicle compliance with federal emission standards
Eliminates exhaust leaks caused by worn gaskets or flanges

Installation Notes and Tips

Ensure the vehicle is cooled down before beginning installation. This part includes inlet and outlet gaskets but does not come with installation hardware. Verify the O2 sensor port alignment before securing the converter. Proper torque on flange bolts is essential to prevent exhaust leaks. Professional installation is recommended for optimal results.

Quality Assurance and Warranty

AP Exhaust catalytic converter 645864 is manufactured to meet federal EPA requirements for direct-fit replacements. The stainless steel construction and ceramic substrate are tested for durability and performance. Warranty details should be confirmed with the product documentation or manufacturer.

Brand	AP Exhaust
Part Number	645864
Body Material	Stainless steel
Inlet Gasket	Yes
Inlet Hardware	None
Inlet Type A	3 bolt loose flange w/ flare
O2 Sensor Ports	1
Outlet Gasket	Yes
Outlet Hardware	None
Outlet Type A	2 bolt welded flange
Overall Length (IN)	48.13
Substrate Material	Ceramic
Type	Federal / epa direct-fit

This part fits 20 vehicles. Search below:

Year	Make	Model	Submodel	Liters	Cylinders	Wheel Base	Position	Notes
2007	Buick	Rainier		4.2L	L6		N/A	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.
2007	Chevrolet	Trailblazer		4.2L	L6		N/A	Direct Fit; (Standard W.B.); 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.
2007	Chevrolet	Trailblazer	LS	4.2L	L6		N/A	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.
2007	Chevrolet	Trailblazer	LT	4.2L	L6		N/A	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.
2007	GMC	Envoy		4.2L	L6		N/A	Direct Fit; (Standard W.B.); 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.
2007	GMC	Envoy	SLT	4.2L	L6		N/A	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.
2007	GMC	Envoy	SLE	4.2L	L6		N/A	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.
2007	Isuzu	Ascender		4.2L	L6		N/A	Direct Fit; (06-07); 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.
2007	Isuzu	Ascender		4.2L	L6	113.0"	N/A	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.
2007	Saab	9-7x		4.2L	L6		N/A	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.
2006	Buick	Rainier		4.2L	L6		N/A	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.
2006	Chevrolet	Trailblazer		4.2L	L6		N/A	Direct Fit; (Standard W.B.); 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.
2006	Chevrolet	Trailblazer	LT	4.2L	L6		N/A	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.
2006	Chevrolet	Trailblazer	LS	4.2L	L6		N/A	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.
2006	GMC	Envoy		4.2L	L6		N/A	Direct Fit; (Standard W.B.); 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.
2006	GMC	Envoy	SLE	4.2L	L6		N/A	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.
2006	GMC	Envoy	SLT	4.2L	L6		N/A	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.
2006	Isuzu	Ascender		4.2L	L6		N/A	Direct Fit; (06-07); 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.
2006	Isuzu	Ascender		4.2L	L6	113.0"	N/A	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.
2006	Saab	9-7x		4.2L	L6		N/A	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.

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