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The WALKER 21144 Quiet-Flow® SS Exhaust Muffler is engineered as a premium, direct-fit, stainless-steel replacement for late-model Ford F-150 trucks. As the only broad-market muffler constructed with 100% stainless steel, it provides superior durability, corrosion resistance, and long-term performance compared to aluminized alternatives.
Its OE-style acoustic louvered tubes, domed heads, and precisely engineered flow path deliver factory-correct exhaust tone and optimized backpressure. Each unit is validated through extensive acoustic and flow testing, ensuring it performs and sounds exactly like the original equipment.
100% Stainless Steel Construction for maximum corrosion resistance and extended service life
Direct-Fit Bolt-On Design — OE-style hangers and mounting points, no welding required
OE-Style Louvered Tubes & Domed Heads provide premium sound quality
Mechanically Joined Tubes & Internal Partitions reduce distortion during thermal expansion
Spun-Locked Heads & OE-Style Spot Welds enhance long-term durability
Internal Drainage System reduces moisture collection to prevent premature failure
Backed by Walker’s Limited Lifetime Warranty
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Natural |
| Body Material | Stainless Steel |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Outside Diameter | 2.500 in |
| Outlet Inside Diameter | 2.750 in |
| Body Height | 7.000 in |
| Body Length | 25.000 in |
| Body Width | 9.000 in |
| Hanger Included | Yes |
| Inlet Location | Offset |
| Outlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 39.500 in |
| Inlet Offset | 1.750 in |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
2015–2020 – 2.7L V6 164cid
2015–2020 – 3.5L V6 3496cc / 213cid
Designed for bolt-on installation using existing OE hanger locations
No welding or modifications required
Ensures factory-grade sound, performance, and emissions compatibility
Covered by Walker’s Limited Lifetime Warranty + 90-Day Safe & Sound Guarantee
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).
