Walker 83485 Catalytic Converter - Left

Walker CalCat Direct-Fit Catalytic Converter

Walker CalCat Part Number 83485 is a direct-fit catalytic converter built for CARB-compliant replacement needs on select Hummer H2 applications. It is designed for a precise OE-style fit and uses a stainless steel body with a ceramic substrate for dependable exhaust flow and emissions control.

Walker CalCat is the Walker emissions product line focused on direct-fit catalytic converters for OBDII and non-OBD vehicles. This line is engineered and validated to meet CARB standards where required, making it a practical choice for regulated replacement work on the Hummer H2.

Key Features

• Direct-fit catalytic converter for specific applications
• CARB certified for use in California and other CARB-regulated states
• Stainless steel body with ceramic substrate
• 3-bolt welded flange inlet and pipe connection outlet
• Pre- and post-catalyst oxygen sensor location
• OE-style fitment for easier exhaust system alignment
• Mounting hardware included
• Fits left-side Hummer H2 applications from 2003-2006

Fitment Details

Compatible with 2006 Hummer H2, left; 2005 Hummer H2, left; 2004 Hummer H2, left; and 2003 Hummer H2, left. This Walker 83485 catalytic converter is listed for CARB Executive Order D-182-69 applications and specific engine family numbers noted in the fitment data.

For shoppers searching by vehicle, this part is a direct-fit catalytic converter for Hummer H2 left-side replacement needs. Walker 83485 is also referenced by part number 83485 for catalog and cross-check purposes.

What This Part Helps Address

• Failed emissions test due to a worn or inefficient catalytic converter
• Check engine light concerns related to catalyst efficiency codes
• Exhaust restriction caused by a damaged converter substrate
• Need for a CARB-compliant replacement on regulated vehicles
• Fitment issues from using a universal converter instead of a direct-fit unit

Installation Notes

Verify the vehicle year, left-side position, and engine family information before installation. This converter uses a 3-bolt welded flange inlet and pipe connection outlet, so exhaust alignment should be checked against the existing system. Additional part 31718 is listed in the fitment notes for installation completion.

Because oxygen sensor locations are pre- and post-catalyst, confirm sensor routing and connector condition during replacement. The direct-fit design is intended to match OE-style exhaust geometry on the specified Hummer H2 applications.

Quality Assurance

Walker states that CalCat converters are designed, tested, and validated for CARB compliance and precise OE-style fitment. Part 83485 is CARB certified and listed for the specified Hummer H2 applications in California and other states that require CARB-compliant replacement converters.