Walker 16600 Catalytic Converter with Integrated Exhaust Manifold - Rear

Walker EPA 16600 Catalytic Converter

Walker EPA 16600 is a direct-fit catalytic converter with integrated exhaust manifold for select 2006-2010 Toyota Highlander and 2006-2008 Lexus RX400h rear applications. Built with a stainless steel converter body and ceramic substrate, it is engineered for EPA-compliant use on OBDII vehicles where listed.

Key Features

• Direct-fit catalytic converter with integrated exhaust manifold
• Stainless steel body with ceramic substrate material
• 6-bolt welded flange inlet and 2-bolt welded flange outlet
• Single inlet, single outlet configuration
• Overall length: 18.75 in.; body length: 6 in.; body height and width: 4 in.
• Pre-catalyst oxygen sensor location
• Mounting hardware included
• Fits rear position applications listed below

Fitment

• Fits 2006-2010 Toyota Highlander, rear. Notes: Fits Fed. & Calif. Emission Models; not legal for sale or use in California and other CARB-compliant states; legal in New York and Maine on EPA Federal Emission Equipped Vehicles only; exhaust gasket is recommended; additional part needed to complete installation: 31332; Ultra Type; EPA.
• Fits 2006-2008 Lexus RX400h, rear. Notes: Fits Fed. & Calif. Emission Models; not legal for sale or use in California and other CARB-compliant states; legal in New York and Maine on EPA Federal Emission Equipped Vehicles only; exhaust gasket is recommended; additional part needed to complete installation: 31332; Ultra Type; EPA.

Product Details

Walker EPA 16600 is part of the Walker Ultra EPA-Compliant Manifold Converter line, which is built for import and domestic OBDII vehicles from 1996 and newer. This unit uses a stainless steel converter body for corrosion resistance and a ceramic substrate for emissions conversion performance. The direct-fit design and welded flange connections support a factory-style replacement on the Toyota Highlander and Lexus RX400h rear exhaust location listed in the fitment data. This part cross-references Eastern Catalytic (e.g., 40642, 40784) for the same application.

Common Problems This Part Addresses

• Failed catalytic converter emissions test results
• Check engine light concerns related to catalyst efficiency
• Exhaust leaks at the manifold/converter assembly
• Restricted exhaust flow from a worn converter
• Replacement needs after corrosion or internal substrate damage

Installation Notes

Confirm the vehicle is equipped with the listed rear application before ordering. An exhaust gasket is recommended, and additional part 31332 is required to complete installation. Verify flange style, sensor location, and emission certification requirements before installation. This part is not CARB certified and is not legal for sale or use in California and other CARB-compliant states.

Quality Assurance

Walker EPA 16600 is manufactured to meet EPA emissions requirements for the listed applications and is intended for direct-fit replacement on approved vehicles. The Walker Ultra EPA-Compliant Manifold Converter line is designed for import and domestic OBDII platforms, including Toyota Highlander and Lexus RX400h rear fitments shown above.