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Walker 18900 Exhaust Muffler
Walker SoundFX Direct Fit Muffler for GM Minivans
Walker SoundFX Direct Fit muffler Part Number 18900 is a specific-fit exhaust muffler built for select Pontiac Montana, Oldsmobile Silhouette, and Pontiac Trans Sport applications. It uses 100% aluminized steel for improved service life versus low-carbon steel and is shaped for a direct replacement on the listed vehicles.
The SoundFX Direct Fit line focuses on OE-style fitment, controlled acoustics, and a clean appearance. For shoppers searching for a Pontiac Montana muffler replacement, Oldsmobile Silhouette exhaust muffler, or Pontiac Trans Sport direct-fit muffler, Part Number 18900 provides a vehicle-specific solution.
Key Features
- Specific-fit exhaust muffler for select GM minivans
- Walker SoundFX Direct Fit product line
- 100% aluminized steel body and finish
- Oval muffler shape with combination muffler design
- 1 inlet and 1 outlet
- 2.25-inch inlet and 2.25-inch outlet inside diameter
- Offset inlet configuration with center outlet configuration
- 2-bolt welded flange inlet connection
- Overall length: 33.25 inches
- Body dimensions: 28 inches long, 8.813 inches wide, 4.25 inches high
Product Details
Walker 18900 is a direct-fit exhaust muffler engineered for 1997-1998 Pontiac Trans Sport, 1997-1999 Oldsmobile Silhouette, and 1999-2001 Pontiac Montana models. The aluminized steel construction helps resist corrosion better than low-carbon steel, while mechanical interior joints and spun-locked heads add durability to the muffler assembly. This part cross-references AP Exhaust 700341 for the same application.
Use this muffler when you need a replacement that matches the listed inlet and outlet configuration, body size, and connection style. The offset inlet and center outlet layout support the factory-style exhaust routing on the covered vehicles, making Part Number 18900 a practical choice for a Pontiac Montana exhaust muffler replacement or a direct-fit Oldsmobile Silhouette muffler service part.
What It Helps Fix
- Exhaust noise from a worn or rusted muffler
- Corrosion-related muffler failure
- Restricted exhaust flow caused by internal damage
- Fitment issues from using a universal muffler on a vehicle-specific system
- Factory exhaust replacement needs on the listed GM minivans
Installation Notes and Tips
- Compatible with specific-fit applications only; verify the vehicle year, make, and model before ordering.
- Fits 1999-2001 Pontiac Montana, N/A.
- Fits 1997-1999 Oldsmobile Silhouette, N/A.
- Fits 1997-1998 Pontiac Trans Sport, N/A.
- If the exhaust uses a welded assembly, replace all required parts during service.
- Confirm the 2.25-inch inlet and outlet sizing and the 2-bolt welded flange connection before installation.
Quality Assurance
Walker SoundFX Direct Fit mufflers are built with aluminized steel construction and internal joint design features intended to support long-term durability and a quality OE-style appearance. Part Number 18900 is part of Walker’s SoundFX Direct Fit line for vehicle-specific exhaust replacement.
| Brand | Walker |
|---|---|
| Part Number | 18900 |
| Position | SoundFX Direct Fit |
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Body Width | 8.813 |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 2.25 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 33.25 |
| Body Height | 4.25 |
| Body Length | 28 |
| Body Material | Steel |
| Finish | Aluminized |
| Inlet 1 Type | 2 bolt welded flange |
| Inlet Configuration | Offset |
| Inlet Offset | 2.625 |
| Inlet Type | 2 bolt welded flange |
| Muffler Type | Combination |
| Outlet 1 Inside Diameter | 2.25 |
| Outlet 1 Type | Pipe connection |
| Outlet Configuration | Center |
| Outlet Type | Pipe connection |
This part fits 8 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Wheel Base | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2001 | Pontiac | Montana | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 2000 | Pontiac | Montana | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1999 | Oldsmobile | Silhouette | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1999 | Pontiac | Montana | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1998 | Oldsmobile | Silhouette | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1998 | Pontiac | Trans Sport | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1997 | Oldsmobile | Silhouette | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1997 | Pontiac | Trans Sport | 3.4L | V6 | 112.0" | N/A | If welded assembly, replace all required parts; 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:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.