Walker 18403 Exhaust Muffler
OE Quality 60-Day Returns
Walker
 SoundFX Direct Fit

Walker 18403 Exhaust Muffler

Brand Walker 18403
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2.25
Body Width 9.75
Inlet Quantity 1
Outlet Inside Diameter 2.25
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 21
Body Height 4.25
Body Length 17
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 2.25
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.875
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Inside Diameter 2.25
Outlet 1 Type Pipe connection
Outlet Configuration Center
Outlet Type Pipe connection
Product line SoundFX Direct Fit
Fits Cadillac and Jeep · 22 vehicles

Direct-fit design. Specific-fit muffler for a straightforward replacement.

Aluminized steel. Helps resist corrosion for longer service life.

Mechanical interior joints. Spun-locked heads add durability and a quality finish.

Cross-references AP Exhaust 700045 for the same application. See all 1.

$55.61Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $55.61
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker SoundFX Direct Fit Muffler for OE-Style Replacement

Walker SoundFX Direct Fit muffler Part Number 18403 is a specific-fit exhaust muffler built for select Jeep Comanche and classic Cadillac applications. It uses an oval steel body with an aluminized finish to support longer service life than low-carbon steel, while maintaining a clean appearance and controlled exhaust tone.

Key Features

  • Direct-fit exhaust muffler for specific vehicle applications
  • Oval muffler body with 2.25-inch inlet and 2.25-inch outlet
  • Offset inlet and center outlet configuration
  • 100% aluminized steel construction for improved corrosion resistance
  • Mechanical interior joints and spun-locked heads for added durability
  • Combination muffler design for balanced exhaust flow and sound control
  • Walker SoundFX Direct Fit line focused on OE-style fit and acoustics

Product Details

Walker SoundFX Direct Fit Part Number 18403 is engineered as a replacement exhaust muffler for vehicles that require a 2.25-inch pipe connection. The oval body measures 21 inches overall, with a 17-inch body length, 9.75-inch body width, and 4.25-inch body height. Its offset inlet and center outlet layout supports the factory-style routing used on the listed applications. This muffler is a practical choice for drivers servicing a 1986-1992 Jeep Comanche with catalytic converter, as well as 1965-1967 Cadillac DeVille and 1965-1967 Cadillac Fleetwood models. This part cross-references AP Exhaust 700045 for the same application.

Common Problems This Muffler Can Address

  • Exhaust noise from a worn or rusted muffler
  • Corrosion-related failure in the original muffler body
  • Fitment issues caused by non-specific universal replacements
  • Loss of factory-style exhaust tone after muffler damage
  • Replacement needs on Jeep Comanche and Cadillac DeVille or Fleetwood exhaust systems

Installation Notes and Tips

Fits 1986-1992 Jeep Comanche, N/A, with catalytic converter; if welded assembly, replace all required parts. Fits 1965-1967 Cadillac DeVille, N/A. Fits 1965-1967 Cadillac Fleetwood, N/A. Verify inlet and outlet diameter, offset, and center configuration before installation to confirm alignment with the existing exhaust system. Because this is a specific-fit muffler, matching the vehicle application and pipe routing is important for proper installation.

Quality Assurance

Walker SoundFX Direct Fit mufflers use aluminized steel construction, mechanical interior joints, and spun-locked heads to support durability in everyday exhaust service. The SoundFX Direct Fit line is built to provide OE-style appearance and controlled acoustics for the listed applications.

Related reading

This part fits 22 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersPositionNotes
1992JeepComanche—4.0LL6N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1992JeepComancheBase2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1991JeepComanche—4.0LL6N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1991JeepComanchePioneer2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1991JeepComancheBase2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1990JeepComanche—4.0LL6N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1990JeepComanchePioneer2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1990JeepComancheBase2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1989JeepComanchePioneer2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1989JeepComancheBase2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1988JeepComanchePioneer2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1988JeepComancheBase2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1988JeepComancheChief2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1988JeepComancheLaredo2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1987JeepComanche—2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1986JeepComanche—2.5LL4N/Awith Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1967CadillacDeVille—7.0LV8N/ASoundFX Direct Fit
1967CadillacFleetwood—7.0LV8N/ASoundFX Direct Fit
1966CadillacDeVille—7.0LV8N/ASoundFX Direct Fit
1966CadillacFleetwood—7.0LV8N/ASoundFX Direct Fit
1965CadillacDeVille—7.0LV8N/ASoundFX Direct Fit
1965CadillacFleetwood—7.0LV8N/ASoundFX Direct Fit
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 700045