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Walker 18399 Exhaust Muffler
| Brand | Walker 18399 |
|---|---|
| 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 | 26.5 |
| 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 | Cadillac · 5 vehicles |
Direct-fit design. Installs as a specific-fit exhaust muffler with no guesswork.
Aluminized steel. Helps resist corrosion for longer service life than low-carbon steel.
Mechanical interior joints. Spun-locked heads add durability and a quality appearance.
Cross-references TYC 700290 and TYC 700375 for the same application. See all 2.
Walker SoundFX Direct Fit Muffler for Cadillac
Walker SoundFX Direct Fit muffler Part Number 18399 is a specific-fit exhaust muffler built for select Cadillac applications. It combines an oval steel body with an aluminized finish to support longer service life than low-carbon steel, while maintaining a clean OE-style appearance and controlled exhaust acoustics.
Compatible with 1991-1993 Cadillac DeVille and 1991-1992 Cadillac Fleetwood, this Walker SoundFX Direct Fit muffler is a practical replacement for worn or damaged factory-style mufflers. The offset 2.5-inch inlet and center 2.25-inch outlet support the listed application geometry for a direct-fit exhaust repair.
Key Features
- Walker SoundFX Direct Fit line for application-specific exhaust replacement
- Part Number 18399
- Oval muffler body with aluminized steel construction
- Offset 2.5-inch inlet and center 2.25-inch outlet
- Mechanical interior joints and spun-locked heads for added durability
- Specific fit for select Cadillac DeVille and Cadillac Fleetwood models
Product Details
The Walker SoundFX Direct Fit series focuses on OE-style replacement mufflers with a balanced combination of appearance, fitment, and sound control. This muffler uses 100% aluminized steel for improved corrosion resistance compared with low-carbon steel, and its combination muffler design supports everyday street use. Part Number 18399 is shaped for the listed Cadillac exhaust layout, making it a strong match for drivers searching for a direct-fit muffler for 1991-1993 Cadillac DeVille or 1991-1992 Cadillac Fleetwood exhaust repair.
This part cross-references TYC (e.g., 700290, 700375) for the same application.
Common Issues It Can Address
- Rust-through or corrosion in the original muffler body
- Exhaust noise caused by a failing internal muffler structure
- Poor fitment from a universal replacement muffler
- Damaged or leaking factory-style exhaust section
- Restoring proper exhaust routing on select Cadillac DeVille and Fleetwood models
Installation Notes and Tips
Verify the inlet and outlet configuration before installation: 2.5-inch offset inlet and 2.25-inch center outlet. For welded assemblies, replace all required exhaust components in the affected section to maintain proper alignment and sealing. Confirm vehicle-specific fitment for your Cadillac DeVille or Cadillac Fleetwood before beginning the repair.
Quality Assurance
Walker builds the SoundFX Direct Fit line with aluminized steel, mechanical interior joints, and spun-locked heads to support durability in exhaust service. Part Number 18399 is engineered as a specific-fit replacement for the listed Cadillac applications.
| Year | Make | Model | Drive Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1993 | Cadillac | DeVille | FWD | 4.9L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1992 | Cadillac | DeVille | FWD | 4.9L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1992 | Cadillac | Fleetwood | FWD | 4.9L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1991 | Cadillac | DeVille | FWD | 4.9L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1991 | Cadillac | Fleetwood | FWD | 4.9L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| No rows match your filter. | |||||||