Walker 21706 Exhaust Muffler
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Walker
 Quiet-Flow

Walker 21706 Exhaust Muffler

Brand Walker 21706
Muffler Type Reflection
Universal Or Specific Fit Specific
Shape Round
Grade Type Regular
Inlet Inside Diameter 3.5
Body Width 11
Inlet Quantity 1
Outlet Inside Diameter 3.5
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 31
Body Height 11
Body Length 25
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 3.5
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.75
Inlet Type Pipe connection
Outlet 1 Inside Diameter 3.5
Outlet 1 Type Pipe connection
Outlet Configuration Offset
Outlet Type Pipe connection
Product line Quiet-Flow
Fits Chevrolet and GMC · 90 vehicles

OE-style sound. Delivers a refined exhaust note with superior flow.

Steel construction. Aluminized finish helps resist corrosion.

Reflection muffler. Round, regular-grade design for a direct-fit exhaust replacement.

Cross-references AP Exhaust 2589 for the same application. See all 1.

$258.68Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $258.68
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Exhaust Muffler options

Walker Quiet-Flow Muffler for Silverado and Sierra HD

Walker Quiet-Flow muffler Part Number 21706 is a specific-fit exhaust muffler built for select Chevrolet Silverado HD and GMC Sierra HD applications. It is designed for OE-style sound control with improved exhaust flow, making it a direct replacement choice for heavy-duty truck exhaust service.

Key Features

  • Specific-fit exhaust muffler for confirmed vehicle applications
  • Round muffler body with a steel construction and aluminized finish
  • 3.5-inch inlet and 3.5-inch outlet with pipe connection ends
  • Offset inlet and offset outlet configuration
  • Reflection muffler design for OE-style sound characteristics
  • Walker Quiet-Flow line for domestic and foreign vehicle coverage
  • Part Number 21706 for catalog and fitment lookup

Product Details

Walker Quiet-Flow Part Number 21706 is a round exhaust muffler with an 11-inch body width, 11-inch body height, 25-inch body length, and 31-inch overall length. The aluminized steel body is built for exhaust system replacement work where a direct-fit muffler is needed. This muffler uses a 3.5-inch inlet and outlet, with offset pipe connections that match the listed heavy-duty truck applications.

Compatible With 2007-2010 Chevrolet Silverado 2500 HD, N/A; 2007-2010 Chevrolet Silverado 3500 HD, N/A; 2007-2010 GMC Sierra 2500 HD, N/A; 2007-2010 GMC Sierra 3500 HD, N/A; 2007 Chevrolet Silverado 2500 HD Classic, N/A; and 2007 GMC Sierra 2500 HD Classic, N/A. Search terms such as Walker 21706 muffler for Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD exhaust replacement align with this fitment.

Walker Quiet-Flow is the product line for buyers looking for an OE-style exhaust note with application-specific fitment. This part cross-references AP Exhaust 2589 for the same application.

Common Uses

  • Replacing a worn or rusted factory muffler
  • Restoring exhaust sound control on HD pickup trucks
  • Addressing exhaust leaks at the muffler body or connections
  • Correcting fitment issues from a damaged or modified muffler
  • Servicing a welded exhaust assembly where the muffler section is being replaced

Installation Notes

Verify the inlet and outlet diameter, offset configuration, and overall length before installation. Because this is a specific-fit muffler, confirm the vehicle application against the listed Silverado HD and Sierra HD models before welding or final assembly. If the exhaust system is a welded assembly, replace all required related parts during service to maintain proper alignment and sealing.

Quality Assurance

Walker backs Quiet-Flow mufflers with a limited lifetime warranty and a 90-day Safe and Sound guarantee. The Quiet-Flow line is positioned for OE-style sound and application-specific exhaust replacement on supported Chevrolet Silverado HD and GMC Sierra HD trucks.

Related reading

This part fits 90 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeLitersCylindersWheel BasePositionNotes
2010ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2010GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2009GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2008GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicExtended Cab Pickup8.1LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicCrew Cab Pickup8.1LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicStandard Cab Pickup8.1LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 2500 HD ClassicExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HDExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HDCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HDExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HDStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HDStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HDCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicCrew Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicStandard Cab Pickup8.1LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicExtended Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicStandard Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicCrew Cab Pickup8.1LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicExtended Cab Pickup8.1LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicCrew Cab Pickup6.0LV8153.0"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicStandard Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 2500 HD ClassicExtended Cab Pickup6.0LV8143.5"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2007GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 2589