Walker 18406 Exhaust Muffler

Brand	Walker 18406
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	2.5
Outlet Quantity	1
Reversible	No
Tunable	No
Overall Length	25
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	Center
Inlet Type	Pipe connection
Muffler Type	Combination
Outlet 1 Inside Diameter	2.5
Outlet 1 Type	Pipe connection
Outlet Configuration	Offset
Outlet Type	Pipe connection
Product line	SoundFX Direct Fit
Fits	Chevrolet and GMC · 20 vehicles

Direct-fit design. Makes replacement straightforward with a specific-fit muffler.

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

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

Cross-references AP Exhaust 700109 for the same application. See all 1.

$60.00Free shipping

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Walker SoundFX Direct Fit Muffler for 1987 GM Trucks

Walker SoundFX Direct Fit muffler part number 18406 is a specific-fit exhaust muffler for select 1987 Chevrolet and GMC trucks. 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

Specific-fit replacement for select 1987 Chevrolet R10, R20, V10, V20 and GMC R1500, R2500, V1500, V2500 applications
Oval muffler design with 2.5-inch inlet and 2.5-inch outlet
Center inlet and offset outlet configuration
100% aluminized steel construction for improved corrosion resistance versus low-carbon steel
Mechanical interior joints and spun-locked heads for added durability
Walker SoundFX Direct Fit line for OE-style replacement on GM truck exhaust systems

Detailed Description

The Walker SoundFX Direct Fit muffler 18406 is built for 1987 Chevrolet and GMC full-size truck applications, including Chevrolet R10, R20, V10, V20 and GMC R1500, R2500, V1500, V2500 models. Its combination muffler design, 25-inch overall length, 21-inch body length, and 4.25-inch body height provide a direct-fit service part for exhaust repairs where the original muffler has worn out, rusted through, or become excessively noisy. This part cross-references AP Exhaust 700109 for the same application.

Walker’s SoundFX Direct Fit product line focuses on replacement mufflers that match vehicle-specific fitment while using aluminized steel construction for durability. For 1987 Chevrolet R10 and GMC R1500 applications, as well as the listed R20, V10, V20, R2500, V1500, and V2500 configurations, part number 18406 supports a straightforward exhaust service solution with a 2.5-inch pipe connection at both ends.

What It Is Used For

Replacing a rusted, leaking, or damaged factory muffler
Restoring exhaust flow after corrosion in the muffler body
Addressing excessive exhaust noise from a failing muffler
Repairing exhaust systems on 1987 Chevrolet and GMC trucks with the listed emissions and catalytic converter configurations
Servicing welded exhaust assemblies where the muffler section must be replaced

Installation Notes and Tips

Compatible With 1987 Chevrolet R10, N/A; 1987 Chevrolet R20, N/A; 1987 Chevrolet V10, N/A; 1987 Chevrolet V20, N/A; 1987 GMC R1500, N/A; 1987 GMC R2500, N/A; 1987 GMC V1500, N/A; and 1987 GMC V2500, N/A, with the notes shown in the fitment data. Verify inlet and outlet orientation before installation: this muffler uses a center inlet and offset outlet layout. If the vehicle has a welded assembly, replace all required exhaust sections listed for the repair rather than only the muffler body.

Quality Assurance

Walker SoundFX Direct Fit mufflers are built with 100% aluminized steel, mechanical interior joints, and spun-locked heads to support durability in exhaust service. The aluminized finish is used to improve service life compared with low-carbon steel construction.

This part fits 20 vehicles

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

Year	Make	Model	Liters	Cylinders	Wheel Base	Position	Notes
1987	Chevrolet	R10	5.7L	V8	131.5"	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1987	Chevrolet	R10	5.7L	V8	131.5"	N/A	SoundFX Direct Fit
1987	Chevrolet	R20	7.4L	V8	131.5"	N/A	with Dual Catalytic Converters; SoundFX Direct Fit
1987	Chevrolet	R20	5.7L	V8	131.5"	N/A	with Dual Catalytic Converters; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	Chevrolet	R20	5.7L	V8	131.5"	N/A	with Dual Catalytic Converters; SoundFX Direct Fit
1987	Chevrolet	R20	7.4L	V8	131.5"	N/A	with Dual Catalytic Converters; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	Chevrolet	R20	5.7L	V8	131.5"	N/A	with Light Duty Emissions; with Single Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	Chevrolet	V10	5.7L	V8	131.5"	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1987	Chevrolet	V10	5.7L	V8	117.5"	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1987	Chevrolet	V20	5.7L	V8	131.5"	N/A	with Light Duty Emissions; with Single Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	R1500	5.7L	V8	131.5"	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	R1500	5.7L	V8	131.5"	N/A	SoundFX Direct Fit
1987	GMC	R2500	5.7L	V8	131.5"	N/A	with Dual Catalytic Converters; SoundFX Direct Fit
1987	GMC	R2500	5.7L	V8	131.5"	N/A	with Light Duty Emissions; with Single Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	R2500	7.4L	V8	131.5"	N/A	with Dual Catalytic Converters; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	R2500	5.7L	V8	131.5"	N/A	with Dual Catalytic Converters; If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	R2500	7.4L	V8	131.5"	N/A	with Dual Catalytic Converters; SoundFX Direct Fit
1987	GMC	V1500	5.7L	V8	131.5"	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	V1500	5.7L	V8	117.5"	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1987	GMC	V2500	5.7L	V8	131.5"	N/A	with Light Duty Emissions; with Single Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
No rows match your filter.

Directly replaces or cross-references 1 part number

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

AP Exhaust — 700109