AP Exhaust 643138 Catalytic Converter - Rear

Direct-Fit Converter Overview

AP Exhaust 643138 is a 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 long-term durability in emissions service.

Compatible With Chevrolet Impala, Buick LaCrosse, and Chevrolet Impala Limited applications where the listed rear or welded-assembly fitment applies. This AP Exhaust catalytic converter is part of the Direct Fit Converter line, which focuses on OE-style replacement geometry for straightforward installation and consistent fit.

Key Features

• Federal / EPA direct-fit design for emissions-system replacement.
• Ceramic substrate material for efficient converter performance.
• Stainless steel body construction for corrosion resistance.
• 2-bolt welded inlet and outlet connections.
• No O2 sensor ports.
• Built to OE dimensions using automated manufacturing processes.

Detailed Fitment and Function

AP Exhaust 643138 is engineered for rear-position applications on 2012-2020 Chevrolet Impala, 2012-2014 Buick LaCrosse, and 2014-2016 Chevrolet Impala Limited listings shown in the fitment data. It is a direct-fit catalytic converter for vehicles that need a replacement matched to the original exhaust layout, including applications noted with Federal and California emissions or PZEV emissions requirements. The part number 643138 should be verified against the vehicle’s emissions label and the notes in the fitment table before ordering.

The Direct Fit Converter line is focused on OE-style replacement parts with manufacturing controls that help maintain consistent dimensions and fitment. AP Exhaust 643138 also cross-references 22935120 for the same application.

Common Problems This Part Can Address

• Failed catalytic converter efficiency codes.
• Exhaust leaks at the converter connection points.
• Restricted exhaust flow from a worn converter core.
• Emissions-test failure related to converter performance.
• Fitment issues when replacing an OE welded assembly.

Installation Notes and Tips

Review the exact fitment row for your vehicle, since some applications list rear position and others note an OE welded assembly or old body style. Confirm emissions requirements, including Federal, California, and PZEV notes, before installation. The converter uses 2-bolt welded inlet and outlet connections and does not include inlet or outlet hardware.

Quality Assurance

AP Exhaust uses proprietary substrate chemistry and automated manufacturing equipment to produce converters built to exact OE dimensions and fitment. The 643138 part number is manufactured as a direct-fit emissions replacement for the listed applications.