Catalytic Converter for Honda Accord (2008-2012) 3.5L Rear

Direct-Fit Rear Catalytic Converter for 2008-2012 Honda Accord

What it Does: The Direct-Fit Rear Catalytic Converter replaces the degraded rear emissions unit on the 2008-2012 Honda Accord to restore factory exhaust velocity, clear emissions-related check engine lights, and reduce tailpipe emissions.

The Stock Honda Accord Underbody Washout Vulnerability

The factory rear underfloor catalytic converter on the 8th-generation CP3 platform routinely suffers from internal substrate breakdown due to thermal fatigue and oil vapor contamination common to high-mileage J35A35/J35Z2 engines. Over time, continuous thermal cycling causes the factory ceramic honeycomb matrix to crumble, melt, or poison its washcoat, creating elevated exhaust backpressure. This restriction chokes exhaust scavenging downstream of the primary warm-up pre-cats, triggering downstream oxygen sensor DTCs such as P0420/P0430, degrading fuel economy, and blunting wide-open-throttle acceleration.

The Engineering Solution

This replacement rear catalytic converter assembly features a heavy-gauge 409 stainless steel shell engineered to withstand road debris, thermal expansion, and road salt corrosion. Internally, a dense, high-flow ceramic substrate is washcoated with an optimized precious metal formulation that ensures rapid light-off and comprehensive catalytic reduction of NOx, CO, and hydrocarbons. Mandrel-bent transition cones maintain laminar exhaust gas velocity without creating turbulent hot spots. Precision laser-cut flanges and automated TIG welding ensure a leak-free, bolt-on seal directly to the factory mid-pipe and muffler assembly using the included hardware.

Technical Specifications

Compatibility

• 2008-2012 Honda Accord EX Sedan 3.5L V6 (CP3)
• 2008-2012 Honda Accord EX-L Sedan 3.5L V6 (CP3)
• 2008-2012 Honda Accord EX Coupe 3.5L V6 (CS2)
• 2008-2012 Honda Accord EX-L Coupe 3.5L V6 (CS2)

Frequently Asked Questions

Does this fit the CP3 Accord?
Yes, this is a direct fit for the 2008-2012 Honda Accord equipped with the 3.5L J35 V6 engine.

Is welding or custom pipe fabrication required to install this converter?
No, this assembly features direct-fit, bolt-on flanges designed to mount directly to factory exhaust mounting locations using the included hardware.

The Honda J-Series Caliber

Engineered to complement the rev-happy harmonics and VTEC delivery of the 3.5L J-Series powerplant, this converter restores precise backpressure balance for smooth throttle tip-in, crisp exhaust resonance, and factory emissions compliance outside CARB-restricted states.