AP Exhaust 644157 Catalytic Converter - Rear

Direct-Fit Catalytic Converter for Civic and ILX

AP Exhaust 644157 is a Federal / EPA direct-fit catalytic converter built for rear-position applications on select Acura ILX and Honda Civic models. It uses a ceramic substrate inside a stainless steel body, with OE-style dimensions and fitment for a straightforward replacement on the listed vehicles.

Engineered for 2012-2015 Honda Civic rear and 2013-2015 Acura ILX rear applications, AP Exhaust 644157 is built to match the original exhaust layout and sensor placement. This part cross-references Honda 18150RX0A00 for the same application.

Key Features

• Federal / EPA direct-fit catalytic converter
• Ceramic substrate material for emissions conversion
• Stainless steel body construction
• 1 O2 sensor port
• 2-bolt welded inlet and 3-bolt welded outlet design
• Overall length: 23 inches
• Built to OE dimensions and fitment

Detailed Description

AP Exhaust 644157 is a rear catalytic converter for the 2012-2015 Honda Civic and 2013-2015 Acura ILX. The converter uses AP Emissions Technologies’ ARISTO substrate chemistry and modern manufacturing methods to support efficient catalyst loading while maintaining exact OE-style dimensions. The result is a direct-fit replacement that aligns with the factory exhaust configuration and sensor location.

For buyers searching for a 2012-2015 Honda Civic rear catalytic converter or a 2013-2015 Acura ILX rear catalytic converter, AP Exhaust 644157 provides the correct fitment and emissions-system layout for the listed Federal and California emissions applications. The part number 644157 is also a useful reference when matching the replacement to the original equipment number.

Common Issues This Part Can Address

• Failed catalytic converter emissions testing
• Check engine light related to catalyst efficiency
• Restricted exhaust flow from a worn converter
• Corrosion or damage to the original rear converter housing
• Incorrect fitment from a non-OE-style replacement part

Installation Notes and Tips

Verify the vehicle’s emissions certification and rear-position application before installation. This converter is listed for Federal and California emissions on the specified vehicles, but it is not for sale or use on vehicles licensed in CA, CO, ME, or NY. Check local regulations before ordering.

Confirm the exhaust flange style, O2 sensor port location, and overall length against the original unit before installation. Professional installation is recommended to ensure proper sealing, sensor placement, and exhaust alignment.

Quality Assurance

AP Exhaust uses automated workstations, spinner welding equipment, and high-speed production lines to build converters to OE dimensions and fitment. The stainless steel body and ceramic substrate are selected to support durable, direct-fit replacement performance for the listed Honda Civic and Acura ILX applications.