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WalkerPart #: 18409

Walker 18409 Exhaust Muffler

Name: Walker 18409 Exhaust Muffler
Brand: Walker
SKU: BDCN-18409
Price: 54.70 USD
Availability: InStock

SoundFX Direct Fit

⚙️ 113 vehicles fit this part

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📦SoundFX Direct Fit

🚗Fitment: Buick, Cadillac, Chevrolet, Dodge, GMC, Oldsmobile, and Pontiac, 98, Bel Air, Bonneville, Caprice, Catalina, Century, Custom Cruiser, Cutlass, Cutlass Salon, Cutlass Supreme, Delta 88, DeVille, Fleetwood, G10, G1500, G20, G2500, G30, G3500, Grand LeMans, Grand Prix, Impala, LeMans, LeSabre, Ramcharger, Regal, Riviera, and Toronado

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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.

Brand	Walker
Part Number	18409
Position	SoundFX Direct Fit
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

This part fits 113 vehicles. Search below:

Year	Make	Model	Submodel	Body Type	Drive Type	Liters	Cylinders	Wheel Base	Position	Notes
1990	Cadillac	DeVille			FWD	4.5L	V8		N/A	If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1990	Cadillac	Fleetwood			FWD	4.5L	V8		N/A	If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1990	Cadillac	Fleetwood			FWD	4.5L	V8		N/A	SoundFX Direct Fit
1989	Cadillac	DeVille			FWD	4.5L	V8		N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1989	Cadillac	Fleetwood			FWD	4.5L	V8		N/A	If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1989	Cadillac	Fleetwood			FWD	4.5L	V8		N/A	SoundFX Direct Fit
1988	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1988	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1987	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1987	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1986	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1986	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1985	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1985	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1984	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1984	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1983	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1982	Chevrolet	G10				4.1L	L6	125.0"	N/A	SoundFX Direct Fit
1982	Chevrolet	G20				4.1L	L6		N/A	with Single Catalytic Converter; SoundFX Direct Fit
1982	Chevrolet	G30				4.1L	L6	125.0"	N/A	with Single Catalytic Converter; SoundFX Direct Fit
1982	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1982	GMC	G1500				4.1L	L6	110.0"	N/A	SoundFX Direct Fit
1982	GMC	G2500				4.1L	L6		N/A	with Single Catalytic Converter; SoundFX Direct Fit
1982	GMC	G3500				4.1L	L6	125.0"	N/A	with Single Catalytic Converter; SoundFX Direct Fit
1981	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1981	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1980	Dodge	Ramcharger			4WD	5.2L	V8		N/A	SoundFX Direct Fit
1980	Dodge	Ramcharger			4WD	5.9L	V8		N/A	SoundFX Direct Fit
1978	Oldsmobile	Toronado				6.6L	V8		N/A	SoundFX Direct Fit
1977	Buick	Century		Wagon		5.7L	V8		N/A	SoundFX Direct Fit
1977	Buick	Century		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1977	Oldsmobile	Cutlass	Vista Cruiser			5.7L	V8		N/A	SoundFX Direct Fit
1977	Pontiac	Grand LeMans				6.6L	V8		N/A	SoundFX Direct Fit
1977	Pontiac	Grand Prix				6.6L	V8		N/A	SoundFX Direct Fit
1977	Pontiac	LeMans				6.6L	V8		N/A	SoundFX Direct Fit
1976	Buick	LeSabre	Custom			7.5L	V8		N/A	SoundFX Direct Fit
1976	Buick	LeSabre	Custom			5.7L	V8		N/A	SoundFX Direct Fit
1976	Buick	Riviera				7.5L	V8		N/A	SoundFX Direct Fit
1976	Chevrolet	Caprice		Sedan		6.6L	V8		N/A	SoundFX Direct Fit
1976	Chevrolet	Caprice		Coupe		6.6L	V8		N/A	SoundFX Direct Fit
1976	Chevrolet	Caprice		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1976	Chevrolet	Impala		Sedan		6.6L	V8		N/A	SoundFX Direct Fit
1976	Chevrolet	Impala		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1976	Chevrolet	Impala		Coupe		6.6L	V8		N/A	SoundFX Direct Fit
1976	Oldsmobile	98	Regency			7.5L	V8		N/A	SoundFX Direct Fit
1976	Oldsmobile	Custom Cruiser				7.5L	V8		N/A	SoundFX Direct Fit
1976	Oldsmobile	Cutlass				5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Oldsmobile	Cutlass	Vista Cruiser			5.7L	V8		N/A	SoundFX Direct Fit
1976	Oldsmobile	Cutlass	Vista Cruiser			7.5L	V8		N/A	SoundFX Direct Fit
1976	Oldsmobile	Cutlass Salon				7.5L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Oldsmobile	Cutlass Salon				5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Oldsmobile	Cutlass Supreme				5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Oldsmobile	Cutlass Supreme				7.5L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Oldsmobile	Delta 88				7.5L	V8		N/A	SoundFX Direct Fit
1976	Oldsmobile	Delta 88				5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Pontiac	Bonneville				6.6L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Bonneville				7.5L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Catalina				7.5L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Catalina				5.7L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Grand LeMans				5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Pontiac	Grand LeMans	Base			6.6L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Grand LeMans	Base			7.5L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Grand Prix				6.6L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	Grand Prix				7.5L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	LeMans				7.5L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	LeMans	Base			5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Pontiac	LeMans	Base			6.6L	V8		N/A	SoundFX Direct Fit
1976	Pontiac	LeMans	Sport			5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1976	Pontiac	LeMans	Sport Coupe			5.7L	V8		N/A	Except Late Models with 2 (in) Tail Pipe; SoundFX Direct Fit
1975	Buick	Century		Coupe		5.7L	V8		N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1975	Buick	Century		Sedan		5.7L	V8		N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1975	Buick	Century		Wagon		5.7L	V8		N/A	SoundFX Direct Fit
1975	Buick	LeSabre				5.7L	V8		N/A	SoundFX Direct Fit
1975	Buick	LeSabre				7.5L	V8		N/A	SoundFX Direct Fit
1975	Buick	Regal				5.7L	V8		N/A	SoundFX Direct Fit
1975	Buick	Riviera				7.5L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Bel Air		Sedan		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Bel Air		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Caprice		Sedan		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Caprice		Convertible		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Caprice		Coupe		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Caprice		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Impala		Coupe		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Impala		Sedan		6.6L	V8		N/A	SoundFX Direct Fit
1975	Chevrolet	Impala		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	98	Regency			7.5L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Custom Cruiser				7.5L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Custom Cruiser				6.6L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Cutlass				5.7L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Cutlass				7.5L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Cutlass Salon				7.5L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Cutlass Salon				5.7L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Cutlass Supreme				7.5L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Cutlass Supreme				5.7L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Delta 88				7.5L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Delta 88				6.6L	V8		N/A	SoundFX Direct Fit
1975	Oldsmobile	Delta 88				5.7L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Bonneville		Sedan		7.5L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Bonneville		Coupe		7.5L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Bonneville		Wagon		7.5L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Bonneville		Sedan		6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Bonneville		Coupe		6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Bonneville		Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Catalina	Safari	Wagon		7.5L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Catalina	Safari	Wagon		6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Catalina	Base			6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Catalina	Base			7.5L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Grand LeMans				6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Grand LeMans	Base			5.7L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Grand Prix				6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	Grand Prix				7.5L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	LeMans				6.6L	V8		N/A	SoundFX Direct Fit
1975	Pontiac	LeMans	Base			5.7L	V8		N/A	SoundFX Direct Fit

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

700290

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.