Catalytic Converter for Lexus GS300 (1998-2005) 3.0L

Direct-Fit Replacement Catalytic Converter for 1998-2005 Lexus GS (JZS160)

What it Does: The direct-fit catalytic converter replaces clogged or degraded factory emissions units on the 1998-2005 GS to restore exhaust flow velocity, clear catalyst efficiency trouble codes, and reduce tailpipe emissions.

The Stock Lexus GS Catalyst Degradation and Exhaust Restriction

Over extended mileage, the factory catalytic converter on the JZS160 chassis suffers from thermal breakdown and carbon washcoat contamination. Deteriorating internal ceramic matrices create exhaust backpressure that restricts scavenged gas exit speeds, dulling low-end torque output and triggering recurrent P0420/P0430 DTCs. Additionally, thermal cycling leads to manifold flange warpage, creating persistent exhaust leaks ahead of the downstream heated oxygen sensors.

The Engineering Solution

This replacement assembly utilizes a high-grade 409 stainless steel outer casing and mandrel-formed tubing engineered to resist corrosion and structural fatigue under prolonged heat cycles. Inside, an optimized flow-through ceramic honeycomb substrate carries an active precious-metal washcoat formulated to oxidize hydrocarbons and carbon monoxide efficiently without choking exhaust flow. Featuring precision laser-cut 4-bolt inlet and 3-bolt outlet flanges, this converter installs directly to factory exhaust hang points and integrates pre-threaded O2 sensor bungs matching OE locations.

What's Included

• 1 × Direct-Fit Stainless Steel Catalytic Converter
• Installation Hardware and Gasket Kit

Technical Specifications

Compatibility

• 1998-2005 Lexus GS300 Base Sedan 3.0L Inline-6 (2JZ-GE)

Frequently Asked Questions & Fitment Warnings

Does this fit the JZS160 GS?

Yes, this is a direct fit for the 1998-2005 Lexus GS equipped with the 2JZ-GE 3.0L engine. Note: This unit is not legal for sale or use in California, New York, Colorado, or Maine, and does not fit 4.0L/4.3L V8 GS models.

Are new gaskets and mounting hardware included for install?

Yes, the converter comes packaged with mating flange gaskets and standard hardware required for bolt-on installation.

The Lexus JDM Caliber

Engineered to match the high-revving characteristics of the inline-six platform, this unit maintains factory acoustic damping while ensuring free-flowing exhaust scavenge lines for reliable daily operation.