Walker 18312 Exhaust Muffler - Rear

Brand	Walker 18312
Position	Rear
Universal Or Specific Fit	Specific
Shape	Round
Grade Type	Regular
Inlet Inside Diameter	2.25
Body Width	5
Inlet Quantity	1
Outlet Quantity	1
Reversible	No
Tunable	No
Overall Length	34.25
Body Height	5
Body Length	18
Body Material	Steel
Finish	Aluminized
Inlet 1 Inside Diameter	2.25
Inlet 1 Type	Pipe connection
Inlet Configuration	Center
Inlet Type	Pipe connection
Muffler Type	Combination
Outlet 1 Outside Diameter	2.75
Outlet 1 Type	Tip
Outlet Configuration	Center
Outlet Outside Diameter	2.75
Outlet Type	Tip
Product line	SoundFX Direct Fit
Fits	Buick, Cadillac, and Oldsmobile · 106 vehicles

Direct-fit design. Built for specific exhaust replacement applications with a clean OE-style layout.

Aluminized steel. 100% aluminized construction helps extend service life versus low-carbon steel.

Durable internals. Mechanical interior joints and spun-locked heads add strength in exhaust service.

Cross-references TYC 700061 and 700066 for the same application. See all 2.

$73.95Free shipping

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Direct-fit muffler for classic GM applications

Walker SoundFX Direct Fit muffler 18312 is built for specific applications and uses a round steel body with an aluminized finish for added service life. It is a combination-style exhaust muffler with center inlet and center outlet pipe connections for a clean replacement layout.

Fits 1979-1985 Buick Riviera, N/A and rear; fits 1979-1985 Cadillac Eldorado, rear; fits 1980-1985 Cadillac Seville, N/A; and fits 1979-1985 Oldsmobile Toronado, N/A. This part cross-references TYC 700061 and 700066 for the same application.

Key features

Specific-fit exhaust muffler for direct replacement applications
100% aluminized steel construction for improved corrosion resistance versus low-carbon steel
Round, regular-grade body with center inlet and center outlet layout
Mechanical interior joints and spun-locked heads for added durability
Outlet tip design with a 2.75-inch outside diameter

Product details

Walker SoundFX Direct Fit 18312 is engineered as a replacement exhaust muffler for select Buick, Cadillac, and Oldsmobile applications from 1979-1985. The aluminized steel body helps extend service life, while the direct-fit configuration supports a straightforward exhaust repair on vehicles such as the Buick Riviera, Cadillac Eldorado, and Cadillac Seville. The SoundFX Direct Fit line focuses on OE-style replacement fitment and controlled exhaust acoustics without changing the basic exhaust routing.

Common issues this part addresses

Rust-through or corrosion in the muffler body
Exhaust noise caused by internal muffler wear
Restricted exhaust flow from a damaged muffler assembly
Fitment problems when replacing a worn factory-style muffler
Need for a replacement muffler with a center-inlet, center-outlet layout

Installation notes

Verify inlet diameter, outlet diameter, body length, and overall length before installation. This muffler uses pipe connections with a 2.25-inch inlet and a 2.75-inch outlet tip, so matching the existing exhaust configuration is important. Some listed applications note welded assemblies; in those cases, replace all required exhaust components as specified by the vehicle setup.

Quality assurance

Walker SoundFX mufflers use aluminized steel, mechanical interior joints, and spun-locked heads to support durability in exhaust service. Part number 18312 is built for specific fitment and is backed by Walker's product engineering for direct-fit exhaust replacement.

This part fits 106 vehicles

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

Year	Make	Model	Submodel	Liters	Cylinders	Fuel Type	Position	Notes
1985	Buick	Riviera	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1985	Buick	Riviera	—	5.0L	V8	—	N/A	SoundFX Direct Fit
1985	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1985	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1985	Buick	Riviera	—	5.0L	V8	—	Rear	SoundFX Direct Fit
1985	Cadillac	Eldorado	—	4.1L	V8	—	Rear	If welded assembly, replace all required parts; SoundFX Direct Fit
1985	Cadillac	Eldorado	Touring	5.7L	V8	—	Rear	SoundFX Direct Fit
1985	Cadillac	Eldorado	Base	5.7L	V8	—	Rear	SoundFX Direct Fit
1985	Cadillac	Eldorado	Cabriolet	5.7L	V8	—	Rear	SoundFX Direct Fit
1985	Cadillac	Seville	—	4.1L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1985	Cadillac	Seville	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1985	Oldsmobile	Toronado	—	5.0L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1985	Oldsmobile	Toronado	—	5.7L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1984	Buick	Riviera	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1984	Buick	Riviera	—	5.0L	V8	—	N/A	SoundFX Direct Fit
1984	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1984	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1984	Buick	Riviera	—	5.0L	V8	—	Rear	SoundFX Direct Fit
1984	Buick	Riviera	Luxury	4.1L	V6	—	Rear	SoundFX Direct Fit
1984	Buick	Riviera	Base	4.1L	V6	—	N/A	SoundFX Direct Fit
1984	Buick	Riviera	Luxury	4.1L	V6	—	N/A	SoundFX Direct Fit
1984	Buick	Riviera	Base	4.1L	V6	—	Rear	SoundFX Direct Fit
1984	Cadillac	Eldorado	—	4.1L	V8	—	Rear	If welded assembly, replace all required parts; SoundFX Direct Fit
1984	Cadillac	Eldorado	Touring	5.7L	V8	—	Rear	SoundFX Direct Fit
1984	Cadillac	Eldorado	Base	5.7L	V8	—	Rear	SoundFX Direct Fit
1984	Cadillac	Eldorado	Cabriolet	5.7L	V8	—	Rear	SoundFX Direct Fit
1984	Cadillac	Seville	—	4.1L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1984	Cadillac	Seville	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1984	Oldsmobile	Toronado	—	5.0L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1984	Oldsmobile	Toronado	—	4.1L	V6	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1984	Oldsmobile	Toronado	—	5.7L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1983	Buick	Riviera	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1983	Buick	Riviera	Base	4.1L	V6	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	XX Anniversary Edition	4.1L	V6	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	Base	5.0L	V8	—	Rear	SoundFX Direct Fit
1983	Buick	Riviera	XX Anniversary Edition	4.1L	V6	—	Rear	SoundFX Direct Fit
1983	Buick	Riviera	Luxury	4.1L	V6	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	Base	4.1L	V6	—	Rear	SoundFX Direct Fit
1983	Buick	Riviera	XX Anniversary Edition	5.0L	V8	—	Rear	SoundFX Direct Fit
1983	Buick	Riviera	XX Anniversary Edition	5.0L	V8	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	Luxury	4.1L	V6	—	Rear	SoundFX Direct Fit
1983	Buick	Riviera	Luxury	5.0L	V8	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	Base	5.0L	V8	—	N/A	SoundFX Direct Fit
1983	Buick	Riviera	Luxury	5.0L	V8	—	Rear	SoundFX Direct Fit
1983	Cadillac	Eldorado	—	5.7L	V8	—	Rear	SoundFX Direct Fit
1983	Cadillac	Eldorado	—	4.1L	V8	—	Rear	If welded assembly, replace all required parts; SoundFX Direct Fit
1983	Cadillac	Seville	—	4.1L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1983	Cadillac	Seville	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1983	Oldsmobile	Toronado	—	5.0L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1983	Oldsmobile	Toronado	—	4.1L	V6	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1983	Oldsmobile	Toronado	—	5.7L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1982	Buick	Riviera	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1982	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1982	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1982	Buick	Riviera	Base	4.1L	V6	—	N/A	SoundFX Direct Fit
1982	Buick	Riviera	Base	5.0L	V8	—	Rear	SoundFX Direct Fit
1982	Buick	Riviera	Limited Edition	5.0L	V8	—	Rear	SoundFX Direct Fit
1982	Buick	Riviera	Base	4.1L	V6	—	Rear	SoundFX Direct Fit
1982	Buick	Riviera	Base	5.0L	V8	—	N/A	SoundFX Direct Fit
1982	Buick	Riviera	Limited Edition	4.1L	V6	—	N/A	SoundFX Direct Fit
1982	Buick	Riviera	Limited Edition	5.0L	V8	—	N/A	SoundFX Direct Fit
1982	Buick	Riviera	Limited Edition	4.1L	V6	—	Rear	SoundFX Direct Fit
1982	Cadillac	Eldorado	—	5.7L	V8	—	Rear	SoundFX Direct Fit
1982	Cadillac	Eldorado	—	4.1L	V6	—	Rear	SoundFX Direct Fit
1982	Cadillac	Eldorado	—	4.1L	V8	—	Rear	If welded assembly, replace all required parts; SoundFX Direct Fit
1982	Cadillac	Seville	—	4.1L	V6	—	N/A	SoundFX Direct Fit
1982	Cadillac	Seville	—	4.1L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1982	Cadillac	Seville	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1982	Oldsmobile	Toronado	—	5.0L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1982	Oldsmobile	Toronado	—	4.1L	V6	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1982	Oldsmobile	Toronado	—	5.7L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1981	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1981	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1981	Buick	Riviera	—	5.7L	V8	—	Rear	without California Emission System; SoundFX Direct Fit
1981	Buick	Riviera	—	4.1L	V6	—	Rear	SoundFX Direct Fit
1981	Buick	Riviera	—	5.7L	V8	—	N/A	without California Emission System; SoundFX Direct Fit
1981	Buick	Riviera	—	5.0L	V8	—	Rear	SoundFX Direct Fit
1981	Buick	Riviera	—	5.0L	V8	—	N/A	SoundFX Direct Fit
1981	Buick	Riviera	—	4.1L	V6	—	N/A	SoundFX Direct Fit
1981	Cadillac	Eldorado	—	5.7L	V8	—	Rear	without California Emission System; SoundFX Direct Fit
1981	Cadillac	Eldorado	—	6.0L	V8	—	Rear	If welded assembly, replace all required parts; SoundFX Direct Fit
1981	Cadillac	Eldorado	—	4.1L	V6	—	Rear	SoundFX Direct Fit
1981	Cadillac	Seville	—	4.1L	V6	—	N/A	SoundFX Direct Fit
1981	Cadillac	Seville	—	5.7L	V8	—	N/A	without California Emission System; SoundFX Direct Fit
1981	Cadillac	Seville	—	6.0L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1981	Oldsmobile	Toronado	—	5.0L	V8	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1981	Oldsmobile	Toronado	—	5.7L	V8	—	N/A	without California Emission System; If welded assembly, replace all required parts; SoundFX Direct Fit
1981	Oldsmobile	Toronado	Brougham	4.1L	V6	—	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1980	Buick	Riviera	—	5.7L	V8	GAS	Rear	SoundFX Direct Fit
1980	Buick	Riviera	—	5.7L	V8	GAS	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1980	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1980	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1980	Cadillac	Eldorado	—	5.7L	V8	—	Rear	SoundFX Direct Fit
1980	Cadillac	Eldorado	—	6.0L	V8	—	Rear	SoundFX Direct Fit
1980	Cadillac	Seville	—	5.7L	V8	GAS	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1980	Cadillac	Seville	—	6.0L	V8	GAS	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1980	Oldsmobile	Toronado	—	5.7L	V8	GAS	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1980	Oldsmobile	Toronado	—	5.0L	V8	GAS	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
1979	Buick	Riviera	—	5.7L	V8	—	Rear	SoundFX Direct Fit
1979	Buick	Riviera	—	5.7L	V8	—	N/A	SoundFX Direct Fit
1979	Buick	Riviera	—	3.8L	V6	—	N/A	SoundFX Direct Fit
1979	Buick	Riviera	—	3.8L	V6	—	Rear	SoundFX Direct Fit
1979	Cadillac	Eldorado	—	5.7L	V8	GAS	Rear	SoundFX Direct Fit
1979	Oldsmobile	Toronado	—	5.7L	V8	GAS	N/A	If welded assembly, replace all required parts; SoundFX Direct Fit
No rows match your filter.

Directly replaces or cross-references 2 part numbers

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

TYC — 700061700066

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