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The Walker® SoundFX® 18977 direct-fit exhaust muffler is engineered to deliver OE-style performance, appearance, and sound for Ford F-150 and Lincoln Mark LT trucks. Built with 100% aluminized steel, it offers improved corrosion resistance compared to low-carbon steel and uses Walker’s proven internal louvered tube technology to reduce radiated noise for factory-quality acoustics.
Mechanical interior joints, reinforced heads, and OE-style mounting points provide strength and longevity, ensuring a long service life even under tough truck duty cycles.
Corrosion-Resistant Aluminized Steel construction for longer life
Direct-Fit Design with OE-style hangers and pipe routing
Factory-Style Sound: Louvered tubes reduce noise vs. perforated designs
Built to Last: Mechanical joints allow for expansion and contraction
Reliable Performance: Spun-locked heads maintain structural integrity
Designed & tested to extend muffler life
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.500 in |
| Body Height | 7.000 in |
| Body Length | 28.000 in |
| Body Width | 9.000 in |
| Overall Length | 32.000 in |
| Inlet Location | Offset |
| Outlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Material | Steel |
| Hanger Included | Yes |
| Reversible | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
| Inlet Offset | 1.625 in |
F-150 (2004–2008)
4.2L V6 (256 cid)
4.6L V8 (281 cid)
5.4L V8 (330 cid)
Also fits 4WD models w/ 4.6L V8
Mark LT (2006–2008)
5.4L V8 (330 cid)
Direct bolt-on installation using OE-style hangers; no welding required
Non-reversible: Must be installed in the correct orientation
Designed for factory piping: Ensure inlet size matches OEM system
Replace old clamps/gaskets as needed to ensure proper sealing
Professional installation recommended for optimal alignment and longevity
Not compatible with modified or aftermarket exhaust systems unless dimensions match
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).
