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The Walker® Quiet-Flow® SS 21565 Exhaust Muffler is engineered with 100% stainless-steel construction for exceptional corrosion resistance and long service life. Designed as a direct-fit, bolt-on replacement, this muffler features OE-style hangers, brackets, and pipe routings that simplify installation with no welding required. Internal partitions and mechanically joined tubes help the unit withstand temperature fluctuations, minimizing distortion and extending durability.
With louvered tubes and domed heads, the Quiet-Flow SS muffler produces premium factory-style sound quality while reducing radiated noise. Acoustic and flow testing ensure dependable OE-style performance you can count on. Backed by Walker’s limited lifetime warranty and 90-Day Safe & Sound® Guarantee, this muffler delivers superior longevity and reliability for your vehicle.
100% Stainless-Steel Construction for maximum corrosion resistance
Direct-Fit Bolt-On Design – OE-style hangers and routing for easy installation
Durable Build – Mechanically joined tubes minimize distortion
Premium Sound Control – OE-style louvered tubes reduce noise
Design Validated – Flow and acoustic testing ensure OE-quality performance
Lifetime Warranty + 90-Day Guarantee for confidence and reliability
| Specification | Value |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Outlet Location | Offset |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter (IN) | 2.500 |
| Body Height (IN) | 7.000 |
| Body Length (IN) | 16.000 |
| Body Width (IN) | 9.000 |
| Hanger Included | No |
| Inlet Location | Offset |
| Inlet Quantity | 1 |
| Body Material | Stainless Steel |
| Outlet Inside Diameter (IN) | 2.250 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
| Overall Length (IN) | 20.250 |
| Inlet Offset (IN) | 2.000 |
Ford
Explorer — 2006–2010 — Rear — 4.6L V8 281cid
Explorer Sport Trac — 2007–2010 — Rear — 4.6L V8 281cid
Mercury
Mountaineer — 2006–2010 — 4.6L V8 281cid
Direct-fit muffler designed to bolt on without welding.
Not reversible — must be installed in correct orientation.
Verify inlet diameter and offset to ensure correct alignment with existing piping.
Exhaust hangers not included; reuse OE hangers where applicable.
Designed for vehicles equipped with the 4.6L V8 only.
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).
