Walker 18409 Exhaust Muffler
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Walker
 SoundFX Direct Fit

Walker 18409 Exhaust Muffler

Brand Walker 18409
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 24
Body Height 4.25
Body Length 21
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 Buick, Cadillac, Chevrolet, Dodge, GMC, Oldsmobile, and Pontiac · 113 vehicles

Direct-fit design. Installs as a specific-fit exhaust muffler with no tuning required.

Aluminized steel. Helps resist corrosion for longer service life than low-carbon steel.

Mechanical interior joints. Spun-locked heads add durability and help maintain a quality appearance.

Cross-references TYC 700290 for the same application. See all 1.

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Walker SoundFX Direct Fit Muffler Overview

Walker SoundFX Direct Fit muffler Part Number 18409 is a specific-fit exhaust muffler built for select Cadillac, Buick, Chevrolet, Oldsmobile, Pontiac, Dodge, and GMC applications. It uses 100% aluminized steel for improved service life versus low-carbon steel and is shaped for a clean OE-style appearance with controlled exhaust acoustics.

The SoundFX Direct Fit line focuses on direct replacement fitment and durable construction. For shoppers searching for a replacement muffler for a 1975-1977 Pontiac Grand Prix, 1975-1976 Chevrolet Impala, or 1980-1988 Dodge Ramcharger exhaust system, Walker 18409 provides a direct-fit solution with the correct inlet and outlet configuration.

Key Features

  • Specific-fit exhaust muffler for select classic and late-1970s to 1990 applications
  • Oval combination muffler design with 1 inlet and 1 outlet
  • 2.5 in. inlet inside diameter and 2.25 in. outlet inside diameter
  • Offset inlet and center outlet configuration
  • 100% aluminized steel body for longer service life than low-carbon steel
  • Mechanical interior joints and spun-locked heads for added durability
  • Aluminized finish for a clean, corrosion-resistant appearance
  • Walker SoundFX Direct Fit part number 18409

Product Details

Walker SoundFX Direct Fit Part Number 18409 is an oval, regular-grade muffler with a steel body, 24-inch overall length, 21-inch body length, 9.75-inch body width, and 4.25-inch body height. The inlet uses a 2.5-inch pipe connection with an offset configuration and 2.875-inch inlet offset, while the outlet uses a 2.25-inch pipe connection with a center configuration. This layout supports direct replacement on listed vehicles where the original exhaust routing matches these dimensions.

This muffler is listed for applications including 1975-1977 Pontiac Grand LeMans and Grand Prix, 1975-1976 Chevrolet Caprice and Impala, 1975-1976 Buick LeSabre and Riviera, and 1989-1990 Cadillac Fleetwood. It also appears in fitment for 1980-1988 Dodge Ramcharger and 1982 Chevrolet G10/G20/G30 and GMC G1500/G2500/G3500 vans, making Walker 18409 a useful search match for owners needing a direct-fit exhaust muffler for these specific vehicles.

This part cross-references TYC 700290 for the same application.

Common Problems This Muffler Can Address

  • Rust-through or corrosion in the original muffler body
  • Exhaust noise caused by a damaged internal baffle or chamber
  • Poor fitment from a previous non-OE-style replacement
  • Exhaust leaks at the muffler connection points
  • Loss of factory-style exhaust tone on listed Cadillac, Buick, Chevrolet, Oldsmobile, Pontiac, Dodge, and GMC vehicles

Installation Notes and Fitment

Compatible With the following vehicles and configurations:

  • Fits 1990 Cadillac DeVille, N/A; if welded assembly, modifications and/or additional parts may be required.
  • Fits 1989-1990 Cadillac Fleetwood, N/A; if welded assembly, modifications and/or additional parts may be required.
  • Fits 1989-1990 Cadillac Fleetwood, N/A.
  • Fits 1989 Cadillac DeVille, N/A; if welded assembly, replace all required parts.
  • Fits 1980-1988 Dodge Ramcharger, N/A.
  • Fits 1982 Chevrolet G10, N/A.
  • Fits 1982 Chevrolet G20, N/A; with Single Catalytic Converter.
  • Fits 1982 Chevrolet G30, N/A; with Single Catalytic Converter.
  • Fits 1982 GMC G1500, N/A.
  • Fits 1982 GMC G2500, N/A; with Single Catalytic Converter.
  • Fits 1982 GMC G3500, N/A; with Single Catalytic Converter.
  • Fits 1978 Oldsmobile Toronado, N/A.
  • Fits 1977 Buick Century, N/A.
  • Fits 1975-1977 Oldsmobile Cutlass, N/A.
  • Fits 1975-1977 Pontiac Grand LeMans, N/A.
  • Fits 1975-1977 Pontiac Grand Prix, N/A.
  • Fits 1975-1977 Pontiac LeMans, N/A.
  • Fits 1975-1976 Buick LeSabre, N/A.
  • Fits 1975-1976 Buick Riviera, N/A.
  • Fits 1975-1976 Chevrolet Caprice, N/A.
  • Fits 1975-1976 Chevrolet Impala, N/A.
  • Fits 1975-1976 Oldsmobile 98, N/A.
  • Fits 1975-1976 Oldsmobile Custom Cruiser, N/A.
  • Fits 1976 Oldsmobile Cutlass, N/A; except late models with 2 in. tail pipe.
  • Fits 1976 Oldsmobile Cutlass Salon, N/A; except late models with 2 in. tail pipe.
  • Fits 1976 Oldsmobile Cutlass Supreme, N/A; except late models with 2 in. tail pipe.
  • Fits 1975-1976 Oldsmobile Delta 88, N/A.
  • Fits 1976 Oldsmobile Delta 88, N/A; except late models with 2 in. tail pipe.
  • Fits 1975-1976 Pontiac Bonneville, N/A.
  • Fits 1975-1976 Pontiac Catalina, N/A.
  • Fits 1976 Pontiac Grand LeMans, N/A; except late models with 2 in. tail pipe.
  • Fits 1976 Pontiac LeMans, N/A; except late models with 2 in. tail pipe.
  • Fits 1975 Buick Century, N/A; if welded assembly, replace all required parts.
  • Fits 1975 Buick Regal, N/A.
  • Fits 1975 Chevrolet Bel Air, N/A.
  • Fits 1975 Oldsmobile Cutlass Salon, N/A.
  • Fits 1975 Oldsmobile Cutlass Supreme, N/A.

Because this is a specific-fit muffler, confirm inlet and outlet sizing, offset, and tailpipe configuration before installation. On welded assemblies, additional exhaust components or modifications may be required to complete the repair.

Quality Assurance

Walker SoundFX Direct Fit mufflers are built with aluminized steel, mechanical interior joints, and spun-locked heads to support durability and consistent exhaust performance. The 18409 part number is engineered as a direct-fit replacement for the listed applications, including classic Pontiac Grand Prix and Chevrolet Impala exhaust service.

Related reading

This part fits 113 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelBody TypeDrive TypeLitersCylindersWheel BasePositionNotes
1990CadillacDeVille——FWD4.5LV8—N/AIf welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1990CadillacFleetwood——FWD4.5LV8—N/AIf welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1990CadillacFleetwood——FWD4.5LV8—N/ASoundFX Direct Fit
1989CadillacDeVille——FWD4.5LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1989CadillacFleetwood——FWD4.5LV8—N/AIf welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1989CadillacFleetwood——FWD4.5LV8—N/ASoundFX Direct Fit
1988DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1988DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1987DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1987DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1986DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1986DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1985DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1985DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1984DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1984DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1983DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1982ChevroletG10———4.1LL6125.0"N/ASoundFX Direct Fit
1982ChevroletG20———4.1LL6—N/Awith Single Catalytic Converter; SoundFX Direct Fit
1982ChevroletG30———4.1LL6125.0"N/Awith Single Catalytic Converter; SoundFX Direct Fit
1982DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1982GMCG1500———4.1LL6110.0"N/ASoundFX Direct Fit
1982GMCG2500———4.1LL6—N/Awith Single Catalytic Converter; SoundFX Direct Fit
1982GMCG3500———4.1LL6125.0"N/Awith Single Catalytic Converter; SoundFX Direct Fit
1981DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1981DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1980DodgeRamcharger——4WD5.2LV8—N/ASoundFX Direct Fit
1980DodgeRamcharger——4WD5.9LV8—N/ASoundFX Direct Fit
1978OldsmobileToronado———6.6LV8—N/ASoundFX Direct Fit
1977BuickCentury—Wagon—5.7LV8—N/ASoundFX Direct Fit
1977BuickCentury—Wagon—6.6LV8—N/ASoundFX Direct Fit
1977OldsmobileCutlassVista Cruiser——5.7LV8—N/ASoundFX Direct Fit
1977PontiacGrand LeMans———6.6LV8—N/ASoundFX Direct Fit
1977PontiacGrand Prix———6.6LV8—N/ASoundFX Direct Fit
1977PontiacLeMans———6.6LV8—N/ASoundFX Direct Fit
1976BuickLeSabreCustom——7.5LV8—N/ASoundFX Direct Fit
1976BuickLeSabreCustom——5.7LV8—N/ASoundFX Direct Fit
1976BuickRiviera———7.5LV8—N/ASoundFX Direct Fit
1976ChevroletCaprice—Sedan—6.6LV8—N/ASoundFX Direct Fit
1976ChevroletCaprice—Coupe—6.6LV8—N/ASoundFX Direct Fit
1976ChevroletCaprice—Wagon—6.6LV8—N/ASoundFX Direct Fit
1976ChevroletImpala—Sedan—6.6LV8—N/ASoundFX Direct Fit
1976ChevroletImpala—Wagon—6.6LV8—N/ASoundFX Direct Fit
1976ChevroletImpala—Coupe—6.6LV8—N/ASoundFX Direct Fit
1976Oldsmobile98Regency——7.5LV8—N/ASoundFX Direct Fit
1976OldsmobileCustom Cruiser———7.5LV8—N/ASoundFX Direct Fit
1976OldsmobileCutlass———5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976OldsmobileCutlassVista Cruiser——5.7LV8—N/ASoundFX Direct Fit
1976OldsmobileCutlassVista Cruiser——7.5LV8—N/ASoundFX Direct Fit
1976OldsmobileCutlass Salon———7.5LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976OldsmobileCutlass Salon———5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976OldsmobileCutlass Supreme———5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976OldsmobileCutlass Supreme———7.5LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976OldsmobileDelta 88———7.5LV8—N/ASoundFX Direct Fit
1976OldsmobileDelta 88———5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976PontiacBonneville———6.6LV8—N/ASoundFX Direct Fit
1976PontiacBonneville———7.5LV8—N/ASoundFX Direct Fit
1976PontiacCatalina———7.5LV8—N/ASoundFX Direct Fit
1976PontiacCatalina———5.7LV8—N/ASoundFX Direct Fit
1976PontiacGrand LeMans———5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976PontiacGrand LeMansBase——6.6LV8—N/ASoundFX Direct Fit
1976PontiacGrand LeMansBase——7.5LV8—N/ASoundFX Direct Fit
1976PontiacGrand Prix———6.6LV8—N/ASoundFX Direct Fit
1976PontiacGrand Prix———7.5LV8—N/ASoundFX Direct Fit
1976PontiacLeMans———7.5LV8—N/ASoundFX Direct Fit
1976PontiacLeMansBase——5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976PontiacLeMansBase——6.6LV8—N/ASoundFX Direct Fit
1976PontiacLeMansSport——5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976PontiacLeMansSport Coupe——5.7LV8—N/AExcept Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1975BuickCentury—Coupe—5.7LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1975BuickCentury—Sedan—5.7LV8—N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1975BuickCentury—Wagon—5.7LV8—N/ASoundFX Direct Fit
1975BuickLeSabre———5.7LV8—N/ASoundFX Direct Fit
1975BuickLeSabre———7.5LV8—N/ASoundFX Direct Fit
1975BuickRegal———5.7LV8—N/ASoundFX Direct Fit
1975BuickRiviera———7.5LV8—N/ASoundFX Direct Fit
1975ChevroletBel Air—Sedan—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletBel Air—Wagon—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletCaprice—Sedan—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletCaprice—Convertible—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletCaprice—Coupe—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletCaprice—Wagon—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletImpala—Coupe—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletImpala—Sedan—6.6LV8—N/ASoundFX Direct Fit
1975ChevroletImpala—Wagon—6.6LV8—N/ASoundFX Direct Fit
1975Oldsmobile98Regency——7.5LV8—N/ASoundFX Direct Fit
1975OldsmobileCustom Cruiser———7.5LV8—N/ASoundFX Direct Fit
1975OldsmobileCustom Cruiser———6.6LV8—N/ASoundFX Direct Fit
1975OldsmobileCutlass———5.7LV8—N/ASoundFX Direct Fit
1975OldsmobileCutlass———7.5LV8—N/ASoundFX Direct Fit
1975OldsmobileCutlass Salon———7.5LV8—N/ASoundFX Direct Fit
1975OldsmobileCutlass Salon———5.7LV8—N/ASoundFX Direct Fit
1975OldsmobileCutlass Supreme———7.5LV8—N/ASoundFX Direct Fit
1975OldsmobileCutlass Supreme———5.7LV8—N/ASoundFX Direct Fit
1975OldsmobileDelta 88———7.5LV8—N/ASoundFX Direct Fit
1975OldsmobileDelta 88———6.6LV8—N/ASoundFX Direct Fit
1975OldsmobileDelta 88———5.7LV8—N/ASoundFX Direct Fit
1975PontiacBonneville—Sedan—7.5LV8—N/ASoundFX Direct Fit
1975PontiacBonneville—Coupe—7.5LV8—N/ASoundFX Direct Fit
1975PontiacBonneville—Wagon—7.5LV8—N/ASoundFX Direct Fit
1975PontiacBonneville—Sedan—6.6LV8—N/ASoundFX Direct Fit
1975PontiacBonneville—Coupe—6.6LV8—N/ASoundFX Direct Fit
1975PontiacBonneville—Wagon—6.6LV8—N/ASoundFX Direct Fit
1975PontiacCatalinaSafariWagon—7.5LV8—N/ASoundFX Direct Fit
1975PontiacCatalinaSafariWagon—6.6LV8—N/ASoundFX Direct Fit
1975PontiacCatalinaBase——6.6LV8—N/ASoundFX Direct Fit
1975PontiacCatalinaBase——7.5LV8—N/ASoundFX Direct Fit
1975PontiacGrand LeMans———6.6LV8—N/ASoundFX Direct Fit
1975PontiacGrand LeMansBase——5.7LV8—N/ASoundFX Direct Fit
1975PontiacGrand Prix———6.6LV8—N/ASoundFX Direct Fit
1975PontiacGrand Prix———7.5LV8—N/ASoundFX Direct Fit
1975PontiacLeMans———6.6LV8—N/ASoundFX Direct Fit
1975PontiacLeMansBase——5.7LV8—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 — 700290