What Walker muffler part numbers fit the 1998-2002 Mercury Grand Marquis 4.6L dual exhaust?

Muffler 21342 for the right-hand side and muffler 21343 for the left-hand side. SoundFX alternatives are 18560 (for 21342) and 18845 (for 21343).

What are the catalytic converter part numbers for this exhaust system?

Converter 53270 (RH) and 53271 (LH). Footnotes state they replace multiple O.E. converters, only failed converters may be replaced, and they fit all emissions vehicles.

What part number is the H-pipe on the Grand Marquis 4.6L dual exhaust?

The H Pipe is Walker part number 50412.

Which parts are specific to the Police Car version?

Resonator 55155 is listed as w/o Resonator (Police Car), and Tail Pipe 56007 is listed as w/o Resonator (Police Car).

Can the Federal/EPA converters in this catalog be installed in California?

No. The document states Federal/EPA converters are not legal for sale in California, and as of January 1, 2009, converters in this catalog cannot be sold or installed in California; CARB-compliant converters must be installed as specifically listed.

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1998-2002 Mercury Grand Marquis 4.6L Dual Exhaust Diagram - Walker Part Numbers

Walker exhaust catalog page for Mercury Marquis showing exhaust components with part numbers

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Walker exhaust system catalog page for a Mercury Marquis showing dual exhaust component layout with part numbers.

AI caption April 2022 · Photo 8 of 10

This document is a printed page from the Walker Emissions Control On-Line Catalog (last updated 08-01-2021, printed 8/13/2021) showing the complete dual exhaust system layout for the 1998–2002 Mercury Grand Marquis with the 4.6L 8-cylinder engine, including the Police Car variant. An exploded diagram identifies every Walker replacement part from the catalytic converters back: converters 53270 (RH) and 53271 (LH), flange gaskets 31336, H-pipe 50412, 2-inch pipe adapters 35335, mufflers 21342 (RH) and 21343 (LH), resonators 55156 and 55155, tail pipe 56007 (without resonator, Police Car), and 35286 hanger insulators. SoundFX muffler alternatives 18560 and 18845 are listed for mufflers 21342 and 21343. Footnotes indicate the converters replace multiple OE converters, fit all emissions vehicles, and that welded assemblies require replacing all required parts. Legal notices explain that Federal/EPA converters are not legal for sale in California and that CARB-compliant converters must be installed as listed. A reader can use this page to identify exact Walker part numbers for a full exhaust replacement on this vehicle.

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Frequently asked questions

What Walker muffler part numbers fit the 1998-2002 Mercury Grand Marquis 4.6L dual exhaust?: Muffler 21342 for the right-hand side and muffler 21343 for the left-hand side. SoundFX alternatives are 18560 (for 21342) and 18845 (for 21343).
What are the catalytic converter part numbers for this exhaust system?: Converter 53270 (RH) and 53271 (LH). Footnotes state they replace multiple O.E. converters, only failed converters may be replaced, and they fit all emissions vehicles.
What part number is the H-pipe on the Grand Marquis 4.6L dual exhaust?: The H Pipe is Walker part number 50412.
Which parts are specific to the Police Car version?: Resonator 55155 is listed as w/o Resonator (Police Car), and Tail Pipe 56007 is listed as w/o Resonator (Police Car).
Can the Federal/EPA converters in this catalog be installed in California?: No. The document states Federal/EPA converters are not legal for sale in California, and as of January 1, 2009, converters in this catalog cannot be sold or installed in California; CARB-compliant converters must be installed as specifically listed.