AP Exhaust 809543 Catalytic Converter - Rear

CARB-Compliant Direct-Fit Catalytic Converter

AP Exhaust 809543 is a CARB compliant direct-fit catalytic converter built for rear-position applications on select Nissan, Infiniti, and Toyota vehicles. It uses a stainless steel body with a ceramic substrate and exact OE-style dimensions for a direct replacement on California emissions applications.

AP Exhaust’s XNSXT02.423A product line focuses on precise fitment and efficient converter construction, using advanced manufacturing methods to help maintain consistent dimensions and reliable installation on the intended vehicle platforms.

• CARB compliant direct-fit catalytic converter
• Stainless steel body with ceramic substrate material
• 2-bolt loose flange with flare inlet and outlet connections
• Overall length: 12.5 in.
• Executive Order D-665-23
• Part number: 809543

Fitment Details

• Fits 2004 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 2003 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 2002 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 2001 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 2000 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 1999 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 1998 Nissan Frontier, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.
• Fits 2001 Infiniti I30, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 2000 Infiniti I30, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 1998 Infiniti I30, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 1997 Infiniti I30, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 1996 Infiniti I30, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 2001 Nissan Maxima, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 2000 Nissan Maxima, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 1998 Nissan Maxima, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 1997 Nissan Maxima, rear; Direct Fit - California; EO Number: D-665-23.
• Fits 2000 Toyota Tacoma, rear; Direct Fit - California; 12.5" OAL; EO Number: D-665-23.

What This Converter Helps Address

• Failed or inefficient rear catalytic converter on California-emissions vehicles
• Check engine light concerns related to catalyst efficiency
• Exhaust restriction caused by a worn or damaged converter
• Emissions test failure tied to converter performance
• Fitment issues from using a non-OE-style replacement

Installation Notes

Verify the vehicle year, make, model, rear position, and California emissions application before installation. This converter uses 2-bolt loose flange w/flare inlet and outlet connections and includes one inlet gasket and one outlet gasket; inlet and outlet hardware are not included. Confirm the 12.5 in. overall length and EO D-665-23 match the vehicle requirements before final assembly.

Quality Assurance

AP Exhaust builds this converter with automated workstations, spinner welding equipment, and high-speed production processes to help maintain OE dimensions and consistent fitment. The ARISTO substrate chemistry is used to support efficient catalyst loading and converter performance while keeping the design aligned with California emissions compliance requirements.

This part cross-references 4NSXT02.4N4A and YTYXT02.4FFJ for the same application.