AP Exhaust Catalytic Converter,Catalytic Converter-Direct Fit P/N:644003

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$523.99
MPN: 644003
Item Package Quantity: 1
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AP Exhaust Catalytic Converter,Catalytic Converter-Direct Fit P/N:644003
AP Exhaust Catalytic Converter,Catalytic Converter-Direct Fit P/N:644003
$523.99

Restore proper exhaust flow and emissions control on your Nissan Maxima with the AP Exhaust Federal/EPA Catalytic Converter (MPN 644003), a direct-fit center converter engineered to the original's dimensions and fitment. It drops in as a direct-fit replacement for the 2009-2014 and 2016-2023 Nissan Maxima (V6-3.5L).

  • 409 stainless steel shell and neck: constructed for longer service life.
  • Aristo Clean by Design catalyst technology: AP's advanced catalyst designed to handle demanding emissions requirements.
  • Ceramic substrate: uses proprietary catalyst loadings for efficient conversion.
  • Hardware where needed: includes two inlet gaskets plus outlet hardware and gasket; inlet hardware is not included.

This center converter uses two 3-bolt welded inlet flanges with gasket stubs and a 2-bolt welded outlet flange, has no sensor ports, and measures 41.5 inches overall. It is a Federal/EPA converter and is not certified for sale or installation in California, New York, or other states that require CARB-compliant replacement converters. Made in the United States.

Frequently Asked Questions

Which vehicles does this converter fit?

It is a direct-fit replacement for the 2009-2014 and 2016-2023 Nissan Maxima with the V6-3.5L engine. Check the Buyer's Guide tab to confirm it matches your vehicle.

Is this converter CARB certified for California?

No. It is a Federal/EPA converter and is not certified for sale or installation in California, New York, or other states that require CARB-compliant replacement converters.

What hardware and gaskets are included?

It includes two inlet gaskets plus outlet hardware and an outlet gasket. Inlet hardware is not included, so consult the service information for the correct fasteners.

Where on the exhaust does this converter install?

The catalog lists it in the center position. Its two 3-bolt welded inlet flanges and 2-bolt welded outlet flange are designed to match the original's connections.

What is this converter made of?

It uses a 409 stainless steel shell and neck for longer service life and a ceramic substrate with AP's Aristo Clean by Design catalyst technology.