Walker Exhaust Exhaust Muffler 21539
Walker Exhaust Exhaust Muffler 21539

Exhaust Muffler for 2004-2008 Ford F-150 & More - Walker 21539

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$182.99
MPN: 21539
Item Package Quantity: 1
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Walker Exhaust Exhaust Muffler P/N:21539
Walker Exhaust Exhaust Muffler P/N:21539
$182.99

Built for precision fit, strong flow and OE-style sound, this Walker Exhaust muffler is the Quiet-Flow SS 21539, a direct-fit replacement exhaust muffler that is acoustic- and flow-tested. It fits many vehicles, among them the 2004-2008 Ford F-150, 2004-2008 Ford Pickup - F100 and 2006-2008 Lincoln Mark LT.

  • Premium acoustic control: OE-style louvered tubes lower noise levels, and OE-style domed heads help reduce radiated noise. Together they give factory-style sound quality compared with straight perforated tubes.
  • Stable construction: Internal partitions and mechanically joined tubes let the muffler expand and contract with temperature changes to minimize distortion. Spun-locked heads and OE-style spot welds add stability.
  • Moisture management: An internal drainage system helps reduce moisture collection inside the muffler.
  • Easy installation: This is a direct-fit, bolt-on design with factory-style brackets and pipe routings, so no specialized fabrication or welding is required.

Specifications: 2.5 in. inlet (ID) and 2.5 in. outlet (ID), both offset. It has an aluminized finish and a specific-fit design.

Walker backs this muffler with a limited lifetime warranty and its exclusive 90-Day Safe and Sound® Guarantee. See walkerexhaust.com for details.

If you are shopping for a 2004-2008 Ford F-150 muffler, see the Buyer's Guide tab for the full list of years, models and engines.

Interchange: 4L3Z5230AA · 4L3Z5230AB · 4L3Z5230CB · 6L3Z5230CA · 6L3Z5230EA · 6L3Z5230GA · 8L3Z5230A · 8L3Z5230C

This part cross-references / interchanges with the following part numbers:

4L3Z5230AA, 4L3Z5230AB, 4L3Z5230CB, 6L3Z5230CA, 6L3Z5230EA, 6L3Z5230GA, 8L3Z5230A, 8L3Z5230C

Frequently Asked Questions

Is this the right F-150 muffler for my 2004-2008 truck?

Walker 21539 is listed as a direct-fit replacement for the 2004-2008 Ford F-150. Check the Buyer's Guide tab to confirm your exact truck and engine.

Does it also fit the 2006-2008 Lincoln Mark LT or the 2004-2008 Ford Pickup - F100?

Yes. The listed applications include the 2006-2008 Lincoln Mark LT and the 2004-2008 Ford Pickup - F100.

What size are the inlet and outlet?

The inlet and outlet each measure 2.5 in. inside diameter, and both are offset. The muffler has an aluminized finish.

Do I need to weld anything to install it?

No. It is a direct-fit, bolt-on replacement with factory-style brackets and pipe routings, so no specialized fabrication or welding is needed.

What are signs a muffler may need replacing?

Common signs include a louder or rumbling exhaust, rattles from under the vehicle, rust-through or holes, and exhaust leaks. Inspect the system to confirm the cause before you replace the muffler.

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