Eastern Convertors 40373 Catalytic Converter with Integrated Exhaust Manifold - Front Left

Direct-Fit Catalytic Converter Manifold

Eastern Convertors DIRECT FIT 40373 is a Federal / EPA direct-fit catalytic converter with integrated exhaust manifold for specific front left radiator-side applications. It is built to OE dimensions for straightforward replacement on select Lexus RX330, Lexus RX400h, Toyota Highlander, and Toyota Sienna models.

The DIRECT FIT product line focuses on exact fitment and consistent manufacturing for replacement exhaust components. This part uses ECO II catalyst technology, a 6-bolt welded inlet, a 2-bolt welded outlet, and one O2 sensor port to match the original exhaust layout on the listed vehicles.

Key Features

• Part number 40373
• Eastern Convertors DIRECT FIT product line
• Federal / EPA direct-fit manifold design
• Integrated catalytic converter and exhaust manifold
• ECO II catalyst type
• 6-bolt welded inlet with inlet gasket and hardware
• 2-bolt welded outlet with outlet gasket and hardware
• One O2 sensor port
• Overall length: 16.5 in.
• Built to OE dimensions and fitment targets

Detailed Description

Eastern Convertors 40373 is engineered for front left, radiator-side replacement on the specified Lexus and Toyota applications. The integrated manifold design simplifies replacement of the exhaust manifold and catalytic converter assembly in one service part, while the OE-style dimensions help maintain proper alignment with the factory exhaust routing. This part number 40373 is a direct-fit solution for 2004-2006 Lexus RX330, 2006-2008 Lexus RX400h, 2004-2007 Toyota Highlander, and 2004-2006 Toyota Sienna.

Manufacturing methods such as automated workstations, spinner welding, and high-speed production lines are used to keep dimensions consistent and support efficient production. The NANO substrate chemistry is used to improve catalyst loading efficiency while keeping the assembly cost-conscious for replacement service.

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

What This Part Helps Address

• Failed catalytic converter efficiency codes
• Cracked or leaking exhaust manifold assembly
• Exhaust leaks at the front left radiator-side location
• Check engine light concerns related to catalyst performance
• Fitment issues from a damaged or corroded OE manifold-converter unit

Installation Notes

• Compatible With 2006-2008 Lexus RX400h, front left radiator side.
• Compatible With 2004-2007 Toyota Highlander, front left radiator side.
• Compatible With 2004-2006 Lexus RX330, front left radiator side.
• Compatible With 2004-2006 Toyota Sienna, front left radiator side.
• Verify emissions requirements before installation; not for sale or use in CA, CO, ME, or NY for vehicles with CA emissions.
• Confirm O2 sensor location, flange style, and manifold orientation against the original part before service.

Quality Assurance

Eastern Convertors uses OE-dimension manufacturing methods and catalyst substrate chemistry intended to support consistent fitment and converter efficiency on the listed applications. The DIRECT FIT line is built for replacement service where exact geometry and emissions-system compatibility matter.