Catalytic Converter for GMC Envoy (2002-2005) 4.2L

$130.95

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Direct-Fit Replacement Catalytic Converter for 2002-2005 GMC Envoy (GMT360)

What it Does: The direct-fit catalytic converter replaces the deteriorated factory emissions core on the 2002-2005 GMC Envoy to eliminate P0420 diagnostic trouble codes and restore factory exhaust gas scavenging.

The Stock GMC Envoy Catalyst Degradation

The OEM catalytic converter on the GMT360 platform suffers from thermal breakdown and precious metal washcoat depletion over extended heat cycles. Operating the naturally aspirated inline-six under sustained loads degrades the internal honeycomb matrix, resulting in catalyst fracturing, substrate sintering, and restricted exhaust flow. When the washcoat fails to facilitate proper reduction and oxidation reactions, downstream O2 sensors register sub-threshold conversion efficiency, triggering persistent P0420/P0430 DTCs, poor fuel economy, and potential internal backpressure spikes that stifle top-end power.

The Engineering Solution

This replacement converter utilizes a high-flow ceramic honeycomb substrate engineered with an active catalytic washcoat to maximize surface area contact and optimize exhaust gas dwell time. Encased in a heavy-gauge, corrosion-resistant stainless steel body, the assembly withstands road debris and severe thermal shock without shell distortion. The system integrates precision-formed loose inlet flanges, an OEM-style 2-bolt welded outlet flange, and factory-placed oxygen sensor bungs to guarantee a leak-free mechanical seal without custom cutting, pipe expanding, or MIG welding.

What's Included

1 x Direct-Fit Catalytic Converter
Installation Bolts / Screws

Technical Specifications

Fitment	2002-2005 GMC Envoy
Engine / Chassis	Atlas LL8 4.2L L6 / GMT360
Stock Output	275 hp / 275 lb-ft
Replaces OEM Part #	55476, 645878, 50365, 19100

Compatibility

2002-2005 GMC Envoy (4.2L L6)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT360 Envoy?

Yes, this is a direct fit for the 2002-2005 GMC Envoy equipped with the Atlas LL8 4.2L inline-six engine. Note: This EPA-compliant 48-state converter cannot be sold or shipped to California, Colorado, New York, or Maine.

Will installation require cutting or welding?

No, this is a complete direct-fit assembly featuring a loose inlet flange and a 2-bolt welded outlet flange designed to bolt directly to OEM exhaust locations.

The GMC Truck Standard

Engineered for the rigorous duty cycles of midsize utility platforms, this exhaust component maintains structural rigidity and optimal backpressure to preserve hauling power and torque under towing conditions.