Catalytic Converter for Lexus SC300 (1999-2000) 3.0L

Direct-Fit EPA Catalytic Converter for 1999-2000 Lexus SC (JZZ31 / Z30)

What it Does: The direct-fit catalytic converter replaces the aged, restricted factory emissions core on the 1999-2000 Lexus SC to restore proper exhaust gas scavenging, clear OBD-II emissions trouble codes, and eliminate exhaust backpressure.

The Stock Lexus SC Substrate Degradation

With decades of thermal cycling, the factory ceramic monolith in the 2JZ-GE exhaust system suffers from carbon accumulation, internal cell collapse, and washcoat attrition. This leads to typical P0420/P0430 DTC faults, choked exhaust gas velocity, and elevated exhaust gas temperatures (EGTs). Choked flow upstream creates excessive cylinder backpressure, directly harming volumetric efficiency across the 3.0-liter inline-six powerband.

The Engineering Solution

Constructed from high-grade stainless steel piping and a heavy-gauge outer shell, this unit resists rust-out and thermal fatigue. Internally, a high-efficiency ceramic substrate loaded with an optimized noble metal washcoat accelerates the oxidation of hydrocarbons (HC) and carbon monoxide (CO) while reducing nitrogen oxides (NOx). Precision-welded 4-bolt inlet and 3-bolt outlet flanges match factory downpipe and mid-pipe dimensions for bolt-on installation without custom cutting or pipe expansion.

What's Included

• 1 × Direct-Fit Catalytic Converter
• Installation Gaskets & Hardware Accessories

Technical Specifications

Compatibility

• 1999 Lexus SC300 Base 3.0L L6 (2JZ-GE)
• 2000 Lexus SC300 Base 3.0L L6 (2JZ-GE)

Frequently Asked Questions & Fitment Warnings

Does this fit the JZZ31 SC?

Yes, this is a direct fit for the 1999-2000 Lexus SC equipped with the 2JZ-GE 3.0L engine. Note: Restricted for sale/use in California, New York, Colorado, and Maine due to CARB regulations; not designed for SC400/SC430 V8 models.

Are new mating gaskets included with this converter?

Yes, installation gaskets and necessary hardware accessories are included in the package for a direct bolt-on seal.

The Lexus GT Standard

Preserve the smooth, high-revving performance of your legendary Toyota JDM straight-six platform with an exhaust solution that keeps the CEL off while maintaining classic 2JZ acoustic clarity and exhaust velocity.