Deliver quiet, OE-style exhaust sound with the Walker Exhaust muffler 21539, a direct-fit, bolt-on replacement that drops into the factory location on the 2004-2008 Ford F-150 and other listed trucks. Part of Walker's Quiet-Flow line, it carries an aluminized finish with a 2.5-inch offset inlet and 2.5-inch offset outlet (inside diameter).
Premium acoustic control: OE-style louvered tubes lower noise levels, while OE-style domed heads help reduce radiated noise for factory-style sound quality.
Built to last: internal partitions and mechanically joined tubes allow expansion and contraction through temperature swings to minimize distortion, while spun-locked heads and OE-style spot welds add stability and service life.
Easy to install: a bolt-on, direct-fit design with factory-style pipe routings, brackets and hangers means no cutting, welding, or custom fabrication.
Design validated: acoustic- and flow-tested for OE-style sound, with an internal drainage system that helps reduce moisture collection. Backed by Walker's limited lifetime warranty and the exclusive 90-Day Safe & Sound Guarantee.
Fitment: 2004-2008 Ford F-150; 2004 Ford F-150 Heritage; 2004-2008 Ford Pickup - F100; 2006-2008 Lincoln Mark LT. See the Buyer's Guide tab to confirm the exact engine for your vehicle.
Interchange: 4L3Z5230AA · 4L3Z5230AB · 4L3Z5230CB · 6L3Z5230CA · 6L3Z5230EA · 6L3Z5230GA · 8L3Z5230A · 8L3Z5230C
This part cross-references / interchanges with the following part numbers:
Will this Ford F-150 muffler fit my truck?
It's a direct-fit replacement for the 2004-2008 Ford F-150, the 2004 F-150 Heritage, the 2004-2008 Ford Pickup - F100, and the 2006-2008 Lincoln Mark LT. Check the Buyer's Guide tab to confirm your exact engine.
What are the inlet and outlet sizes?
It has a 2.5-inch offset inlet and a 2.5-inch offset outlet, both measured by inside diameter (ID).
Do I need to weld or cut anything to install it?
No. It's a bolt-on, direct-fit replacement with factory-style pipe routings, brackets and hangers, so no special fabrication or welding is required.
What interchange numbers does this muffler replace?
It cross-references 4L3Z5230AA, 4L3Z5230AB, 4L3Z5230CB, 6L3Z5230CA, 6L3Z5230EA, 6L3Z5230GA, 8L3Z5230A and 8L3Z5230C.
Is this muffler covered by a warranty?
Yes. It's backed by Walker's limited lifetime warranty and the exclusive 90-Day Safe & Sound Guarantee; visit Walkerexhaust.com for details.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
