AP Exhaust 644181 Catalytic Converter - Rear

AP Exhaust 644181 Rear Catalytic Converter

AP Exhaust 644181 is a Federal / EPA direct-fit catalytic converter built for the rear position on select Lexus IS250 models. It is engineered with a stainless steel body, ceramic substrate, and welded flange connections for a direct replacement on 2006-2012 Lexus IS250 applications.

The AP Exhaust Direct Fit Converter line focuses on application-specific exhaust replacement parts that match factory-style fitment. For buyers searching for a rear catalytic converter for Lexus IS250 2006-2012, AP Exhaust 644181 provides a direct-fit solution with the correct inlet and outlet configuration for the listed vehicle.

Key Features

• Federal / EPA direct-fit catalytic converter
• Fits 2006-2012 Lexus IS250, rear
• Stainless steel body construction
• Ceramic substrate material
• Two O2 sensor ports
• Welded flange inlet and outlet connections
• Federal and California emissions fitment noted for the listed application
• AP Exhaust part number 644181

Detailed Description

AP Exhaust 644181 is a rear catalytic converter for Lexus IS250 models from 2006 through 2012. The direct-fit design follows the original exhaust layout with two inlet connections, one outlet connection, and welded flange interfaces to support a factory-style replacement. The stainless steel housing and ceramic substrate are specified for exhaust system service where a direct replacement catalytic converter is required.

This part number 644181 is listed for the rear position on the Lexus IS250 and is identified for Federal / EPA direct-fit use. If you are searching for a rear catalytic converter for 2006-2012 Lexus IS250, AP Exhaust 644181 matches the confirmed fitment data provided here.

What It Is Used For

• Replacing a worn or failed rear catalytic converter
• Restoring exhaust flow after converter restriction
• Addressing emissions-related fault codes tied to the rear converter
• Repairing exhaust leaks at the converter assembly connection points
• Returning the exhaust system to the correct factory-style layout on Lexus IS250 models

Installation Notes and Tips

Verify the rear position and emissions configuration before ordering. This converter uses welded flange inlet and outlet connections, so inspect the mating exhaust flanges, gaskets, and sensor locations before installation. Confirm that the vehicle is a 2006-2012 Lexus IS250 with the listed rear application and compare the original converter layout to AP Exhaust 644181 before beginning the repair.

Quality Assurance

AP Exhaust Direct Fit Converter parts are built as application-specific exhaust replacements for confirmed vehicle fitment. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.