Catco 4678 Catalytic Converter

Overview

Catco 4678 is a catalytic converter for a direct-fit exhaust repair on select applications. It is listed for the 2004 Buick Rainier and is identified for Federal and California emissions configurations, with state-use restrictions noted in the fitment data.

Key Features

• Direct-fit catalytic converter for exhaust system replacement
• Cataloged for Federal and California emissions applications
• Fits 2004 Buick Rainier, N/A
• Part number 4678 for accurate ordering and catalog lookup

Detailed Description

Catco 4678 is a replacement catalytic converter intended for exhaust service where the original emissions component needs to be renewed. The direct-fit design supports a straightforward replacement path on the listed 2004 Buick Rainier application, and the catalog notes Federal and California emissions coverage for this part number. Because emissions regulations vary by state, the fitment notes should be reviewed before installation or purchase. This part number, 4678, should be matched carefully to the vehicle and emissions configuration shown in the catalog.

What It Helps Address

• Failed catalytic converter efficiency codes
• Exhaust restriction from a worn substrate
• Emissions test failure related to converter performance
• Rattling or damaged converter internals

Installation Notes

Verify the vehicle’s emissions requirements and state restrictions before installation. The catalog notes direct fitment for the listed application, but the fitment record also includes use restrictions for CA, CO, ME, and NY. Confirm the part number 4678 against the vehicle’s emissions label and exhaust configuration before ordering.

Quality Assurance

Catco catalogs this converter as a direct-fit exhaust replacement for the listed application. Review all fitment notes carefully to ensure the correct emissions configuration is selected.