AP Exhaust 645112 Catalytic Converter

Direct-Fit Catalytic Converter for GM Trucks and SUVs

AP Exhaust Direct Fit Converter 645112 is a Federal / EPA direct-fit catalytic converter built for specific Chevrolet and GMC applications. It uses a stainless steel body with a ceramic substrate and is configured with dual inlets, a single outlet, and four O2 sensor ports for emissions-system integration.

Compatible With 2014-2020 Chevrolet Silverado 1500, Tahoe, and 2015-2020 GMC Sierra 1500, Yukon, and Yukon XL applications listed below. AP Exhaust 645112 is part of the Direct Fit Converter line, which focuses on application-specific exhaust replacement for vehicles that require OE-style fitment and emissions-system compatibility.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body construction
• Ceramic substrate material
• Two inlet connections and one outlet connection
• Four O2 sensor ports
• Loose flange and welded flange inlet configuration
• Norma ball outlet connection
• Boxed for storage and handling

Detailed Description

This catalytic converter is engineered for direct replacement on select Chevrolet Silverado 1500, Tahoe, GMC Sierra 1500, Yukon, and Yukon XL models. The AP Exhaust 645112 uses a stainless steel housing for exhaust-system durability and a ceramic substrate to support emissions conversion in a direct-fit layout. Its Federal / EPA configuration is intended for vehicles that require a non-CARB replacement part.

The Direct Fit Converter line is built around vehicle-specific exhaust geometry, helping maintain the original connection style with a 3-bolt loose flange inlet, a 3-bolt welded flange inlet, and a ball-style outlet. The four O2 sensor ports support the factory sensor layout used on the listed applications. This part number, 645112, is a practical replacement choice when servicing emissions-related exhaust components on the covered GM platforms.

What This Part Is Used For

• Replacing a worn or failed catalytic converter on listed GM trucks and SUVs
• Restoring exhaust after catalyst efficiency codes or emissions-test failures
• Addressing exhaust leaks at flange or outlet connection points
• Maintaining factory-style O2 sensor placement on supported applications
• Servicing Federal / EPA emissions configurations on direct-fit vehicles

Installation Notes and Tips

Verify the vehicle’s emissions package before ordering. This converter is listed for Federal and California emissions applications, but it is not CARB certified. Confirm the inlet and outlet connection style, O2 sensor port count, and model-year coverage before installation. Professional installation is recommended for proper sealing, sensor transfer, and exhaust alignment.

Quality Assurance

AP Exhaust Direct Fit Converter 645112 is built as an application-specific replacement exhaust component with stainless steel construction and a ceramic substrate. It is boxed for protection during handling and storage.

• Fits 2015-2020 Chevrolet Tahoe, N/A
• Fits 2015-2020 GMC Yukon, N/A
• Fits 2015-2020 GMC Yukon XL, N/A
• Fits 2014-2018 Chevrolet Silverado 1500, N/A
• Fits 2014-2018 GMC Sierra 1500, N/A