Catalytic Converter for Acura RL (2009-2012) 3.7L Front Left & Right

Direct-Fit Replacement Front Catalytic Converters for 2009-2012 Acura RL (KB2)

What it Does: The Front Left and Right Catalytic Converter Set replaces deteriorated factory catalytic units on the 2009-2012 RL to clear catalyst efficiency DTCs (P0420/P0430) and restore exhaust flow without requiring custom fabrication.

The Stock Acura RL Catalytic Converter Degradation

The high-compression 3.7L V6 runs demanding thermal cycles that degrade factory ceramic washcoats over extended mileage. In the KB2 engine bay, excessive exhaust gas temperatures break down catalyst substrates, causing micro-fractures, washcoat dusting, and cell sintering. This degradation triggers recurring P0420/P0430 DTCs, trips downstream O2 sensor flags, increases backpressure across cylinder banks, and chokes top-end performance on the high-output J37A2 powerplant.

The Engineering Solution

Manufactured as direct-fit replacements for OEM parts 16643 and 16658, these bank-specific front converters utilize corrosion-resistant stainless steel housings and durable ceramic honeycombs loaded with uniform precious metal washcoats. Thick, precision-machined flanges resist thermal warping and prevent high-pressure exhaust leaks at the manifold and intermediate junctions. Designed to re-establish proper scavenging dynamics and lower restriction on high-mileage platforms.

What's Included

• 1x Front Left Catalytic Converter
• 1x Front Right Catalytic Converter
• Mounting Hardware

Technical Specifications

Compatibility

• 2009 Acura RL 3.7L V6 (Base, Technology, Advance)
• 2010 Acura RL 3.7L V6 (Base, Technology, Advance)
• 2011 Acura RL 3.7L V6 (Base, Technology, Advance)
• 2012 Acura RL 3.7L V6 (Base, Technology, Advance)

Frequently Asked Questions & Fitment Warnings

Does this fit the KB2 RL?

Yes, this is a direct fit for the 2009-2012 Acura RL equipped with the J37A2 engine. Note: This assembly is EPA-compliant but not certified for sale or use in California or New York emissions applications.

Will the OEM heat shields bolt directly up?

No, aftermarket casing geometry means the factory heat shield does not fit perfectly and may require minor modification or removal during professional installation.

The Acura Engineering Caliber

The SH-AWD drivetrain demands exact cylinder balance and smooth exhaust scavenging; these converters restore factory backpressure metrics and maintain clean engine management feedback across the entire rev range.