Walker 83390 Catalytic Converter with Integrated Exhaust Manifold - Front

Walker CalCat Catalytic Converter Manifold

Walker CalCat Part Number 83390 is a catalytic converter with integrated exhaust manifold built for CARB-compliant replacement needs on select Nissan Altima applications. It is designed for a precise OE-style fit and is validated for use on OBDII and non-OBD vehicles where CARB standards apply.

Walker CalCat is the Walker product line focused on CARB-certified replacement converters for regulated emissions applications. This manifold-style design uses a stainless steel converter body with a ceramic substrate to support proper exhaust flow and emissions control while matching the original mounting layout.

Key Features

• CARB certified with Executive Order D-182-63
• Integrated exhaust manifold design for OE-style replacement
• Stainless steel converter body for durability
• Ceramic substrate material
• 5-bolt welded flange inlet and 4-bolt welded flange outlet
• Pre-catalyst oxygen sensor location
• Includes front gasket
• Mounting hardware included
• Fits select 2007-2009 Nissan Altima front applications

Detailed Description

Walker 83390 is engineered for the front position on 2007-2009 Nissan Altima models with CARB-compliant replacement requirements. It is a manifold catalytic converter assembly with an oval inlet port, round outlet port, and an overall length of 20.25 inches, built to match the original exhaust connection points and support proper installation alignment. The CARB Executive Order D-182-63 and the listed engine family numbers confirm its approved application for California and other states that require CARB-certified replacement converters. Walker 83390 is a direct-fit emissions component for drivers needing a legal replacement on the Nissan Altima front exhaust manifold/catalyst assembly.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Failed catalytic converter emissions testing
• Check engine light concerns related to catalyst efficiency
• Damaged or leaking front exhaust manifold converter assembly
• Replacement needs after corrosion or heat-related wear
• CARB compliance requirements for regulated states

Installation Notes and Tips

Fits 2009 Nissan Altima, front. Fits 2008 Nissan Altima, front. Fits 2007 Nissan Altima, front. Verify the engine family number and emissions requirements before installation, since CARB applications are specific to the listed vehicle configuration. Additional part 31355 is required to complete installation, and the front gasket is included. Confirm flange alignment, oxygen sensor placement, and exhaust sealing surfaces before tightening the assembly.

Quality Assurance

Walker CalCat converters are designed, tested, and validated to meet CARB standards for the listed applications. Part Number 83390 is backed by CARB Executive Order D-182-63 for approved use on the specified Nissan Altima front fitments.