Dorman 679-577 Pre-Converter Catalytic Converter Compatible with Select Nissan Models

The Dorman 679-577 is a direct-fit pre-converter (also known as a pre-cat or upstream catalytic converter) designed to replace the failed or degraded original equipment unit on select Nissan models. Positioned upstream of the main catalytic converter in the exhaust system, the pre-converter plays a critical role in reducing harmful emissions during cold starts and during the warm-up phase of engine operation.

Manufactured in the USA, this Dorman pre-converter is engineered to OEM specifications for a bolt-on, hassle-free installation without cutting, welding, or modification. The unit is built to restore proper exhaust flow and emissions control performance.

Key Features:

• Direct OEM replacement pre-converter (upstream catalytic converter)
• Engineered for a precise, bolt-on fit on compatible Nissan vehicles
• Manufactured in the USA to Dorman's quality standards
• Restores proper exhaust emissions performance and exhaust flow
• Designed to meet or exceed original equipment specifications
• Not CARB Compliant — not legal for sale or use in California or other CARB-regulated states

Important Notice: This part is not compliant with California Air Resources Board (CARB) regulations and is intended for use in non-CARB states only. Always verify emissions compliance requirements for your state before purchasing.

Dorman Products is a trusted name in OE FIX automotive replacement parts, offering an extensive catalog of hard-to-find and dealer-exclusive components for domestic and import vehicles.