Walker 21563 Exhaust Muffler
OE Quality 60-Day Returns
Walker
 Quiet-Flow SS

Walker 21563 Exhaust Muffler

Brand Walker 21563
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2
Body Width 11
Inlet Quantity 1
Outlet Inside Diameter 2
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 25
Body Height 5.5
Body Length 21
Body Material Stainless steel
Finish Aluminized
Inlet 1 Inside Diameter 2
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 1.5
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Inside Diameter 2
Outlet 1 Type Pipe connection
Outlet Configuration Offset
Outlet Type Pipe connection
Product line Quiet-Flow SS
Fits Ford and Mercury · 15 vehicles

100% stainless steel. Corrosion-resistant construction helps stand up to harsh exhaust conditions.

Precision fit. OE-style replacement with superior flow and sound.

Oval combination muffler. A versatile exhaust design with pipe connections for straightforward installation.

Cross-references 6L2Z5230AK, 7L2Z5230A and 8A2Z5230A for the same application. See all 3.

$92.55Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
Order total $92.55
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker Quiet-Flow SS Muffler for Explorer and Mountaineer

Walker Quiet-Flow SS Part Number 21563 is a specific-fit exhaust muffler built with stainless-steel body construction and an OE-style sound profile. It is engineered for direct replacement on select Ford Explorer, Ford Explorer Sport Trac, and Mercury Mountaineer applications.

Key Features

  • Specific-fit exhaust muffler for direct application matching
  • Oval body shape with a 25-inch overall length
  • 2-inch inlet and 2-inch outlet pipe connections
  • Offset inlet and offset outlet configuration
  • Stainless-steel body construction with aluminized finish
  • Combination muffler design for controlled exhaust flow and sound
  • Walker Quiet-Flow SS line for OE-style exhaust tone

Product Details

The Walker Quiet-Flow SS muffler line is built around precision fitment, smooth exhaust flow, and a sound level that follows original-equipment expectations. Part Number 21563 uses an oval body measuring 11 inches wide, 5.5 inches high, and 21 inches long, with a 1.5-inch inlet offset and pipe-connection ends for a clean replacement layout. This muffler is a practical choice for drivers servicing a Ford Explorer muffler replacement, a Ford Explorer Sport Trac exhaust repair, or a Mercury Mountaineer muffler service where factory-style fit and sound matter. This part cross-references 6L2Z5230AK and 7L2Z5230A for the same application.

Common Issues This Muffler Can Address

  • Exhaust noise from a worn or rusted muffler
  • Reduced exhaust flow caused by internal deterioration
  • Corrosion-related failure in the muffler body
  • Factory exhaust tone that has become louder or uneven
  • Replacement needs on welded exhaust assemblies when required parts are serviced together

Installation Notes and Tips

Compatible With 2006-2010 Ford Explorer, N/A; 2007-2010 Ford Explorer Sport Trac, N/A; and 2006-2010 Mercury Mountaineer, N/A. Verify inlet and outlet alignment, offset orientation, and overall length before installation. Because this application may involve welded exhaust assemblies, inspect the surrounding exhaust components and replace all required parts as needed for proper fitment.

Quality Assurance

Walker Quiet-Flow SS mufflers are positioned as a stainless-steel replacement line with precision fit and OE-style sound characteristics. Part Number 21563 is part of Walker’s Quiet-Flow SS product line for domestic and import vehicle applications.

Related reading

This part fits 15 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersPositionNotes
2010FordExplorer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2010FordExplorer Sport Trac—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2010MercuryMountaineer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2009FordExplorer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2009FordExplorer Sport Trac—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2009MercuryMountaineer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2008FordExplorer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2008FordExplorer Sport Trac—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2008MercuryMountaineer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2007FordExplorer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2007FordExplorer Sport Trac—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2007MercuryMountaineer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2006FordExplorer—4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2006MercuryMountaineerLuxury4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2006MercuryMountaineerConvenience4.0LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
6L2Z5230AK7L2Z5230A8A2Z5230A