Catalytic Converter for Mitsubishi Eclipse (2006-2012) 3.8L Left & Right

Direct-Fit Catalytic Converter Set for 2006-2012 Mitsubishi Eclipse

What it Does: The Left and Right Catalytic Converter Assembly replaces degraded factory manifold catalytic converters on the 2006-2012 Mitsubishi Eclipse 3.8L to eliminate P0420/P0430 diagnostic trouble codes, restore exhaust scavenging velocity, and ensure federal emissions compliance.

The Stock Mitsubishi Eclipse Catalyst Degradation

The factory close-coupled manifold converters on the 4G Eclipse are exposed to extreme thermal cycling and exhaust gas pulses directly off the cylinder heads. Over time, thermal fatigue causes the factory washcoat to break down, sintering the precious metal loading and sintering the internal monolith. This deterioration leads to core fracture, restricted exhaust flow, elevated backpressure, sluggish high-RPM throttle response, and persistent downstream oxygen sensor catalyst efficiency codes (P0420 bank 1, P0430 bank 2).

The Engineering Solution

This direct-fit dual-bank catalytic converter assembly utilizes heavy-gauge, corrosion-resistant 409 stainless steel tubing precision-formed to match factory routing. High-efficiency, thermal shock-resistant ceramic honeycomb substrates are loaded with an optimized precious metal washcoat to provide rapid light-off and reliable hydrocarbon, carbon monoxide, and NOx conversion without choking exhaust velocity. Integrated thick-gauge mounting flanges ensure leak-free seal integrity under high thermal load, mating directly to factory downpipes and exhaust manifolds without cutting or custom welding. Factory-located oxygen sensor bungs maintain proper sensor depth and exposure for accurate closed-loop fuel management.

Technical Specifications

Compatibility

• 2006-2012 Mitsubishi Eclipse GT 3.8L V6 (Coupe)
• 2007-2012 Mitsubishi Eclipse GT 3.8L V6 (Spyder Convertible)

Frequently Asked Questions

Does this fit the DK4A Eclipse?
Yes, this assembly is engineered as a direct replacement for the 2006-2012 Mitsubishi Eclipse equipped with the transverse 6G75 3.8L V6 engine.

Will this converter assembly turn off catalyst efficiency codes like P0420 and P0430?
Yes, the washcoat loading and high-density ceramic substrate restore factory emissions reduction thresholds, clearing catalytic efficiency DTCs assuming upstream air-fuel mixtures and oxygen sensors are operating within specification.

The Mitsubishi JDM Performance Standard

Preserve the distinct, aggressive exhaust note and high-rpm breathing characteristics of the 3.8L MIVEC platform while keeping emissions systems fully functional and inspection-ready.