AP Exhaust 643151 Catalytic Converter - Rear

Direct-Fit Rear Catalytic Converter

AP Exhaust Direct Fit Converter 643151 is a Federal / EPA direct-fit catalytic converter built for rear-position applications on select Honda and Acura vehicles. It uses a stainless steel body, OE-style 3-bolt welded inlet and outlet connections, and a single O2 sensor port for a factory-style replacement.

Compatible With 2014-2021 Acura MDX, 2016-2019 Acura MDX, 2020 Acura MDX, 2020-2021 Honda Pilot, 2016-2019 Honda Pilot, 2020 Honda Ridgeline, and 2017-2019 Honda Ridgeline rear applications. AP Exhaust 643151 is part of the Direct Fit Converter line, which focuses on exact OE dimensions and fitment for straightforward replacement work.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body construction
• 3-bolt welded inlet and outlet connections
• Single O2 sensor port
• Rear-position application
• Built to OE dimensions for factory-style fitment

Product Details

AP Exhaust 643151 uses proprietary substrate chemistry and modern manufacturing methods to support efficient converter loading while keeping the unit dimensionally consistent with OE specifications. The result is a rear catalytic converter replacement that matches the original layout on supported Honda Pilot, Honda Ridgeline, and Acura MDX applications. This part cross-references Walker (e.g., 16467, 16468) for the same application.

Common Problems This Part Addresses

• Failed catalytic converter efficiency codes
• Exhaust leaks at the converter flange area
• Restricted exhaust flow from a worn substrate
• Check engine light concerns related to rear converter performance
• Replacement needs after corrosion or physical damage

Installation Notes

• Verify rear-position fitment before ordering.
• Confirm Federal / EPA application details for your vehicle.
• Check local emissions rules before installation, especially for vehicles licensed in CA, CO, ME, or NY where restrictions are noted for certain applications.
• Inspect mating flanges, gaskets, and exhaust hangers during replacement to ensure proper sealing and alignment.

Quality Assurance

AP Exhaust builds this converter with automated workstations, spinner welding equipment, and high-speed production lines to maintain OE-style dimensions and consistent fitment. The Direct Fit Converter line is engineered for replacement applications where accurate alignment and emissions-system compatibility matter.