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The WALKER® SoundFX® 18955 muffler is engineered as a direct-fit replacement designed to restore factory-style sound, performance, and durability for Ford F-150 applications. Built from 100% aluminized steel, this muffler offers enhanced corrosion resistance and long service life, aided by a moisture-reducing internal drainage system.
Its louvered tube design helps reduce radiated noise, while mechanically joined internal tubes accommodate thermal expansion to prevent distortion. OE-style hangers and pipe routing ensure fast, hassle-free installation.
Aluminized Steel Construction resists rust better than low-carbon steel alternatives
Direct-Fit, Bolt-On Design — no cutting or welding needed
OE-Style Sound using louvered tube internal acoustics
Durable Mechanical Joints withstand temperature cycling
Spun-Locked Heads add strength and stability
Designed to extend muffler life even under demanding conditions
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.500 in |
| Outlet Inside Diameter | 2.500 in |
| Body Height | 7.000 in |
| Body Length | 30.000 in |
| Body Width | 9.000 in |
| Overall Length | 34.000 in |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Inlet Location | Offset |
| Outlet Location | Offset |
| Body Material | Steel |
| Hanger Included | Yes |
| Reversible | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
| Inlet Offset | 1.625 in |
2001–2003
4.6L V8 (281cid)
5.4L V8 (330cid)
2004
4.6L V8 (281cid)
5.4L V8 (330cid)
Direct-fit design: Bolts to factory exhaust system using OE-style hangers and alignment points.
No welding required: Engineered for a straightforward bolt-on replacement.
Aluminized construction: Provides good corrosion resistance in moderate climates.
Muffler is non-reversible: Ensure inlet and outlet orientation matches the original unit.
Inspect clamps & hardware: Replace worn or corroded components during installation.
Professional installation recommended for optimal fit and sealing.
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
