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Walker 18909 Exhaust Muffler
| Brand | Walker 18909 |
|---|---|
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Inlet Inside Diameter | 2.25 |
| Body Width | 11 |
| Outlet Inside Diameter | 2.25 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 31.625 |
| Body Height | 5.5 |
| Body Length | 20 |
| Body Material | Steel |
| Finish | Aluminized |
| Inlet 1 Type | 2 bolt loose flange |
| Inlet 2 Inside Diameter | 2.25 |
| Inlet 2 Type | Pipe connection |
| Inlet Configuration | Offset |
| Inlet Offset | 3.5 |
| Inlet Quantity | 2 |
| Inlet Type | 2 bolt loose flange |
| 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 | Ford and Mercury · 8 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 help maintain a quality appearance.
Cross-references AP Exhaust 700430 for the same application. See all 1.
Walker SoundFX Direct Fit Muffler for Explorer and Mountaineer
Walker SoundFX Direct Fit muffler Part Number 18909 is a specific-fit exhaust muffler for select 1998-2001 Ford Explorer and Mercury Mountaineer applications. It is built with aluminized steel for improved service life versus low-carbon steel and is shaped to deliver a clean OE-style appearance with controlled exhaust sound.
Key Features
- Specific-fit exhaust muffler for direct replacement applications
- Oval body design with a 31.625-inch overall length
- 2.25-inch inlet and 2.25-inch outlet sizing
- Aluminized steel construction with aluminized finish
- Mechanical interior joints and spun-locked heads for added durability
- Combination muffler design for balanced exhaust flow and sound control
- Walker SoundFX Direct Fit line focuses on OE-style fitment and acoustics
Detailed Description
Walker 18909 is engineered for vehicles that use dual inlets and a center outlet layout, with an offset inlet configuration and a 2-bolt loose flange connection on the primary inlet. The oval steel body measures 11 inches wide, 5.5 inches high, and 20 inches long, making it a direct-fit replacement for exhaust service on 1998 Ford Explorer and Mercury Mountaineer models built after 01/28/1998, as well as 1999-2001 Ford Explorer and Mercury Mountaineer applications. This part cross-references AP Exhaust 700430 for the same application.
The SoundFX Direct Fit product line is aimed at drivers who want a replacement muffler that matches the original exhaust layout while maintaining favorable acoustics. Part Number 18909 is a practical choice when servicing a worn or rusted muffler on a Ford Explorer or Mercury Mountaineer with the listed factory configuration.
Common Problems This Muffler Can Address
- Exhaust noise caused by a damaged or rusted muffler
- Corrosion-related failure in the original muffler body
- Poor exhaust tone from a deteriorated internal baffle structure
- Fitment issues when replacing a factory-style dual-inlet muffler
- Need for an OE-style replacement on select Explorer and Mountaineer models
Installation Notes and Tips
Verify inlet and outlet sizing, offset dimensions, and flange style before installation. This muffler is not reversible or tunable, so orientation matters during replacement. If the exhaust uses a welded assembly, replace all required related parts to restore proper alignment and sealing. Confirm vehicle build date for 1998 applications, since fitment applies after 01/28/1998.
Quality Assurance
Walker uses 100% aluminized steel in this SoundFX Direct Fit muffler for longer service life than low-carbon steel construction. Mechanical interior joints and spun-locked heads are used to support durability in everyday exhaust service.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2001 | Ford | Explorer | 5.0L | V8 | N/A | with Dual Inlets; If welded assembly, replace all required parts; SoundFX Direct Fit |
| 2001 | Mercury | Mountaineer | 5.0L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 2000 | Ford | Explorer | 5.0L | V8 | N/A | with Dual Inlets; If welded assembly, replace all required parts; SoundFX Direct Fit |
| 2000 | Mercury | Mountaineer | 5.0L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1999 | Ford | Explorer | 5.0L | V8 | N/A | with Dual Inlets; If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1999 | Mercury | Mountaineer | 5.0L | V8 | N/A | If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1998 | Ford | Explorer | 5.0L | V8 | N/A | with Dual Inlets; After 01/28/1998; If welded assembly, replace all required parts; SoundFX Direct Fit |
| 1998 | Mercury | Mountaineer | 5.0L | V8 | N/A | After 01/28/1998; If welded assembly, replace all required parts; SoundFX Direct Fit |
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