Catalytic Converter for Chevrolet S-10 (1996-1999) 2.2L Rear

Direct-Fit Rear Catalytic Converter for 1996-1999 Chevrolet S-10 (GMT325)

What it Does: The direct-fit rear catalytic converter replaces the depleted or restricted factory emissions brick on the 1996-1999 Chevrolet S-10 to clear P0420/P0430 DTCs, relieve exhaust backpressure, and restore engine volumetric efficiency.

The Stock Chevrolet S-10 Substrate Degradation

Factory catalytic units on the GMT325 platform endure severe thermal cycling and prolonged carbon blow-by from the high-mileage LN2 (Vortec 2200) engine. Over time, the original ceramic honeycomb experiences washcoat sintering and structural thermal fracture. This degradation triggers persistent downstream O2 sensor fault codes (P0420), while broken internal substrate creates an exhaust restriction that strangles mid-range torque, induces poor idle stability, and causes excessive exhaust gas retention within the manifold.

The Engineering Solution

Engineered to exceed standard aftermarket thermal thresholds, this rear assembly utilizes a corrosion-resistant 409 stainless steel housing paired with a heavy-duty 600 CPSI cordierite ceramic substrate. The core features a precise ratio of palladium and rhodium precious metals to maximize chemical reduction of unburned hydrocarbons and carbon monoxide without constricting exhaust flow. Built with CNC mandrel-bent transition piping, precision-machined heavy-gauge connection flanges, and factory-indexed oxygen sensor bungs, it installs directly in place of OEM numbers 25175249 and 25314443 without requiring cutting or TIG welding.

What's Included

• 1x Direct-Fit Rear Catalytic Converter
• Mounting Hardware

Technical Specifications

Compatibility

• 1996-1999 Chevrolet S-10 2.2L L4 (Rear Position, Federal 49-State Emissions Only)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT325 S-10?

Yes, this is a direct fit for the 1996-1999 Chevrolet S-10 equipped with the LN2 2.2L engine. This part is not legal for sale, purchase, or use on vehicles registered in California, Colorado, New York, or Maine.

Are cutting or welding modifications required for installation?

No, this unit is manufactured with direct-fit bolt-on flanges and factory-positioned O2 bungs, allowing installation using standard mechanical hand tools.

The Chevrolet Truck Standard

Work-grade light trucks require rugged components capable of sustained load. This 409 stainless steel converter delivers robust structural durability, eliminating exhaust rattles while maintaining reliable backpressure control under heavy bed payloads and continuous utility driving.