Quiet-Flow SS Muffler
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Walker Quiet-Flow SS Muffler

Part No. 21541 Warranty Details  

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Walker® is the only aftermarket exhaust manufacturer in North America with the capability to combine industry-leading coverage with a direct fit OE-style replacement, 100% structural stainless steel muffler, which provides over three times the average lifespan of competitors' aluminized replacement mufflers. Walker® Quiet-FlowSS is available for a vast majority of top-selling domestic and foreign-nameplate applications. In addition to Walker's renowned precision fit, superior flow, and OE-style sound, these mufflers feature 409 stainless steel heads, shell, bushings, louvered tubes and partitions. Walker® Quiet-FlowSS mufflers have a limited lifetime warranty and a 90-day Safe and Sound® guarantee. See www.walkerexhaust.com for warranty and guarantee details.

Product Features:
  • 100% structural stainless steel construction
  • 3X the life expectancy vs. typical aluminized mufflers
  • OE-style louvered tube technology lowers noise level for premium OE-style sound compared to straight perforated tubes
  • Precise OE-style routing & hanger positions for quick & easy installation
  • Comprehensive internal drainage system for corrosion resistance
  • OE-style domed heads help reduce radiated noise compared to flat heads
  • Spun-locked heads to help prevent rupture
  • Limited Lifetime Warranty and exclusive 90-Day Safe & Sound Guarantee
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Inlet Configuration:Offset
Inlet Inside Diameter:2.500 in
Inlet Quantity:1
Internal Construction:Combination
OE Replacement:Direct OE Replacement
Outlet Configuration:Offset
Outlet Inside Diameter:2.500 in
Outlet Quantity:1
Outlet Type:Pipe Connection
Overall Length:32.000 in
Shell Diameter Height:7.000 in
Shell Diameter Width:9.000 in
Shell Length:28.000 in
Shell Material:Stainless Steel
Shell Shape:Oval

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1 Question | 1 Answer
Displaying question 1
  • Q:

    The Walker Website says that this muffler is the correct fit for a 2005 F-150 STX 4WD 133"WB 4.6L, Why does the Advance Auto Parts website say that this is not compatible with my truck? Is it because the AAP website does not take into account the Wheel Base, or is the Walker Website incorrect?
    Asked on 12/18/2014 by Tony from Canonsburg, PA

    1 answer



      Great question, Tony! I have researched the 2005 Ford F-150 with the 4.6L V8 and you are correct. The 126" (styleside and flareside regular cab 6.5ft bed) and 133" (styleside 5.5 ft bed SuperCab) wheelbase trucks utilize this Walker Quiet-Flow Mufller (Part No. 21541). Thank you for bringing this to our attention and I will have this corrected.

      When you replace your muffler, make sure to pick up a new extension pipe (Part No. 52356) and intermediate pipe (Part No. 52358) as well 4 2-1/2" exhaust clamps (Part No. 35337). There is a diagram of your exhaust available here: http://mastercatalog.walkerexhaust.com/english/ExhaustCouponLargeScreen.asp?img=1019

      Answered on 12/29/2014 by Heath, ASE Parts Specialist from AAP
Displaying question 1

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