Walker 18390 Exhaust Muffler - Front
OE Quality 60-Day Returns
Walker
 SoundFX Direct Fit

Walker 18390 Exhaust Muffler - Front

Brand Walker 18390
Position Front
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2.5
Body Width 9.75
Inlet Quantity 1
Outlet Inside Diameter 2.25
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 23
Body Height 4.25
Body Length 18
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 2.5
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 · 27 vehicles

Direct-fit design. Installs as a specific replacement with no modifications needed.

Aluminized steel. Helps extend service life compared with low-carbon steel.

Mechanical interior joints. Spun-locked heads add durability for dependable exhaust performance.

Cross-references TYC 700059 for the same application. See all 1.

$65.05Free shipping
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Step 2 — Quantity
Order total $65.05
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker SoundFX Direct Fit Muffler for Cadillac

Walker SoundFX Direct Fit muffler Part Number 18390 is a specific-fit exhaust muffler built for select Cadillac applications, including Eldorado, Seville, DeVille, and Fleetwood models. It uses 100% aluminized steel for improved service life versus low-carbon steel and is shaped to deliver a clean OE-style appearance with controlled exhaust sound.

Key Features

  • Specific-fit exhaust muffler for select Cadillac vehicles
  • Oval muffler body with a 23-inch overall length
  • 2.5-inch offset inlet and 2.25-inch center outlet
  • Aluminized steel body and finish for corrosion resistance
  • Mechanical interior joints and spun-locked heads for added durability
  • Combination muffler design for balanced exhaust tone
  • Walker SoundFX Direct Fit line focuses on direct replacement fitment and consistent acoustics

Product Details

Walker 18390 is part of the SoundFX Direct Fit product line, which is built for direct replacement applications where fit, appearance, and exhaust tone matter. This muffler is configured with a 2.5-inch pipe connection inlet, 2.25-inch pipe connection outlet, offset inlet placement, and center outlet placement. The oval steel body measures 18 inches long, 9.75 inches wide, and 4.25 inches high, making it a practical replacement for factory-style exhaust layouts on Cadillac Eldorado, Seville, DeVille, and Fleetwood models.

This part cross-references TYC 700059 for the same application. Walker 18390 is a direct-fit exhaust muffler for 1971-1974 Cadillac DeVille, 1971-1974 Cadillac Eldorado, 1971-1974 Cadillac Fleetwood, 1979-1980 Cadillac Eldorado, 1980-1985 Cadillac Seville, and 1981-1985 Cadillac Eldorado front applications where noted.

What It Helps Address

  • Exhaust noise from a worn or damaged muffler
  • Rust or corrosion on an original steel muffler
  • Poor exhaust tone after factory muffler deterioration
  • Fitment issues when replacing a direct-fit Cadillac muffler
  • Need for an OE-style replacement on Cadillac Eldorado, Seville, DeVille, or Fleetwood

Installation Notes and Tips

Verify inlet and outlet diameters, offset and center configuration, and overall length before installation. This muffler is not reversible and is not tunable, so orientation matters during exhaust system replacement. For welded assemblies, replace all required parts to maintain proper alignment and sealing. Confirm vehicle-specific fitment for your Cadillac Eldorado, Seville, DeVille, or Fleetwood before installation.

Quality Assurance

Walker SoundFX Direct Fit mufflers are built with aluminized steel, mechanical interior joints, and spun-locked heads to support durability in exhaust service. The 18390 part number is engineered for specific-fit replacement use and consistent exhaust acoustics.

Related reading

This part fits 27 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
1985CadillacEldorado4.1LV8—FrontIf welded assembly, replace all required parts; SoundFX Direct Fit
1985CadillacSeville4.1LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1984CadillacEldorado4.1LV8—FrontIf welded assembly, replace all required parts; SoundFX Direct Fit
1984CadillacSeville4.1LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1983CadillacEldorado4.1LV8—FrontIf welded assembly, replace all required parts; SoundFX Direct Fit
1983CadillacSeville4.1LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1982CadillacEldorado4.1LV8—FrontIf welded assembly, replace all required parts; SoundFX Direct Fit
1982CadillacSeville4.1LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1981CadillacEldorado6.0LV8—FrontIf welded assembly, replace all required parts; SoundFX Direct Fit
1981CadillacSeville6.0LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1980CadillacEldorado5.7LV8—FrontSoundFX Direct Fit
1980CadillacEldorado6.0LV8—FrontSoundFX Direct Fit
1980CadillacSeville6.0LV8GASN/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1980CadillacSeville5.7LV8GASN/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1979CadillacEldorado5.7LV8GASFrontSoundFX Direct Fit
1974CadillacDeVille7.7LV8—N/ASoundFX Direct Fit
1974CadillacEldorado8.2LV8—N/ASoundFX Direct Fit
1974CadillacFleetwood7.7LV8—N/ASoundFX Direct Fit
1973CadillacDeVille7.7LV8—N/ASoundFX Direct Fit
1973CadillacEldorado8.2LV8—N/ASoundFX Direct Fit
1973CadillacFleetwood7.7LV8—N/ASoundFX Direct Fit
1972CadillacDeVille7.7LV8—N/ASoundFX Direct Fit
1972CadillacEldorado8.2LV8—N/ASoundFX Direct Fit
1972CadillacFleetwood7.7LV8—N/ASoundFX Direct Fit
1971CadillacDeVille7.7LV8—N/ASoundFX Direct Fit
1971CadillacEldorado8.2LV8—N/ASoundFX Direct Fit
1971CadillacFleetwood7.7LV8—N/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.
TYC — 700059