AP Exhaust 645766 Catalytic Converter - Front

Direct-Fit Catalytic Converter for GM Vans

AP Exhaust Direct Fit Converter 645766 is a Federal / EPA direct-fit catalytic converter built for front-position exhaust service on select Chevrolet Express 3500 and GMC Savana 3500 vans. It uses a stainless steel body with a ceramic substrate and is configured for direct replacement on emissions-controlled applications.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body construction
• Ceramic substrate material
• Front position application
• Two inlet connections and one outlet connection
• Four O2 sensor ports
• Welded flange and flare/spin flange connection design
• AP Exhaust Direct Fit Converter line for application-specific exhaust replacement

Fitment Details

Fits 2016-2020 Chevrolet Express 3500, front. Fits 2016-2020 GMC Savana 3500, front. This AP Exhaust 645766 catalytic converter is listed for Federal and California emissions applications in the confirmed fitment data, while the converter itself is not CARB certified.

Product Description

AP Exhaust 645766 is built as a direct replacement catalytic converter for front exhaust placement on 2016-2020 Chevrolet Express 3500 and 2016-2020 GMC Savana 3500 vans. The direct-fit layout supports a cleaner replacement path for vehicles that need an emissions-system repair with the correct inlet, outlet, and sensor-port configuration. The stainless steel housing and ceramic substrate are specified for this application, and the unit is boxed for shipment and handling.

The AP Exhaust Direct Fit Converter product line focuses on application-matched exhaust components, and this part number is engineered around the factory-style connection points used on the Express 3500 and Savana 3500. If you are replacing a front catalytic converter on a Chevrolet Express 3500 or GMC Savana 3500, part number 645766 provides the correct direct-fit format for the listed model years.

Common Repair Uses

• Replacing a failed front catalytic converter on a Chevrolet Express 3500
• Replacing a front catalytic converter on a GMC Savana 3500
• Addressing emissions-related fault codes tied to converter efficiency
• Restoring exhaust flow after converter substrate damage or restriction
• Repairing exhaust leaks at the converter connection points

Installation Notes

Verify the vehicle’s emissions configuration and sensor layout before installation. This converter uses welded flange and flare/spin flange connection points, with four O2 sensor ports, so the existing exhaust routing and sensor placement should be matched to the vehicle before removal of the original unit. Confirm front-position fitment on the Express 3500 or Savana 3500 and compare the factory exhaust configuration to AP Exhaust 645766 prior to installation.

Quality Assurance

AP Exhaust supplies this direct-fit converter with a stainless steel body and ceramic substrate for the listed applications. The part is boxed and built to match the confirmed fitment data for 2016-2020 Chevrolet Express 3500 and GMC Savana 3500 front applications.