Catalytic Converter for Acura RL (2005-2008) 3.5L

Direct-Fit Manifold Catalytic Converters for 2005-2008 Acura RL (KB1)

What it Does: This direct-fit manifold catalytic converter pair replaces both front and rear bank units on the 2005-2008 Acura RL (KB1) with the J35A8 3.5L V6 to restore emissions compliance and exhaust flow.

The Stock Acura RL Converter Failure

Close-coupled to the cylinder heads on the KB1 chassis, factory manifold converters on the J35A8 3.5L V6 endure extreme thermal cycling and heat soak. Over time, repeated expansion fractures or glazes the internal ceramic substrate, separating it from its mat. As washcoat efficiency drops, downstream O2 sensors detect oxygen storage loss, triggering P0420 and P0430 codes while broken substrate restricts exhaust flow.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light: Persistent P0420 or P0430 codes from degraded catalyst washcoat.
• Substrate Rattle: Metallic rattling during cold starts or acceleration from fractured ceramic core pieces.
• Exhaust Restriction: Sluggish throttle response and failed emissions testing from clogged honeycomb passages.

The Direct-Fit Stainless Catalytic Converter Solution

This complete front and rear bank set uses corrosion-resistant stainless steel bodies and piping to resist heat cracking and rust. Each unit contains a high-flow ceramic honeycomb substrate with a precious-metal washcoat calibrated for OBD-II compliance. Built with 8-inch by 5-inch bodies, factory cylinder head flanges, and integrated O2 sensor ports, both converters bolt directly in place without cutting or welding.

What's Included

• 2 x Manifold Catalytic Converters (Left and Right Banks)
• 2 x Ring Seals
• 2 x Exhaust Manifold Gaskets
• 14 x Bolts with Nuts and Washers

Technical Specifications

Compatibility

• 2005 Acura RL 3.5L V6 SH-AWD (KB1)
• 2006 Acura RL 3.5L V6 SH-AWD (KB1)
• 2007 Acura RL 3.5L V6 SH-AWD (KB1)
• 2008 Acura RL 3.5L V6 SH-AWD (KB1)

Frequently Asked Questions & Fitment Warnings

Does this fit the KB1 RL?

Yes. This is a direct fit for the 2005-2008 Acura RL equipped with the J35A8 3.5L V6 engine. Excludes 2009-2012 RL 3.7L (KB2) models. EPA Federal compliant only—not CARB approved or legal for vehicles registered in California, New York, Colorado, or Maine.

Will this clear P0420/P0430 codes, and are O2 sensors included?

Yes for worn catalysts; O2 sensors are not included. Installing both new converters restores catalyst efficiency to clear P0420 and P0430 codes after checking for exhaust leaks and transferring or replacing your O2 sensors.

Are gaskets and mounting hardware included for installation?

Yes. Both ring seals, exhaust manifold gaskets, and 14 bolts with nuts and washers are included. Let the exhaust cool completely, soak fasteners with penetrating oil, and torque evenly.

The Acura Precision Standard

Replacing both bank converters simultaneously restores balanced scavenging and throttle response across the J35A8 V6. Engineered for OEM flange alignment and OBD-II emissions accuracy, this pair returns your KB1 RL to clean, rattle-free operation.