Walker 21753 Exhaust Muffler
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Walker
 Quiet-Flow

Walker 21753 Exhaust Muffler

Brand Walker 21753
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 29
Body Height 11
Body Length 23
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 · 110 vehicles

OE-style sound. Quiet-Flow muffler delivers a refined exhaust note.

Reflection design. Engineered for superior flow through the muffler.

Aluminized steel. Helps resist corrosion for longer service life.

Cross-references AP Exhaust 2644 for the same application. See all 1.

$254.02Free 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 $254.02
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 HD Trucks

Walker Quiet-Flow muffler Part Number 21753 is a specific-fit exhaust muffler built for select Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD applications. It is designed for drivers who want OE-style exhaust sound with improved flow in a direct replacement format.

Key Features

  • Walker Quiet-Flow line for OE-style sound and balanced exhaust performance
  • Specific fit for select 2011-2019 Chevrolet Silverado HD and GMC Sierra HD trucks
  • Round muffler body with steel construction and aluminized finish
  • 3.5-inch inlet and 3.5-inch outlet with pipe connection ends
  • Offset inlet and outlet configuration for application-specific exhaust routing
  • Reflection muffler type for controlled exhaust tone
  • Part Number 21753 for catalog and fitment lookup

Product Details

Walker Quiet-Flow 21753 is a round exhaust muffler with an 11-inch body width, 11-inch body height, and 23-inch body length. Overall length measures 29 inches. The steel body and aluminized finish are selected for everyday exhaust service, while the reflection-style internal design supports a quieter, factory-like sound profile. This muffler is a direct-fit solution for HD truck exhaust repair and replacement work on Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD models.

The Quiet-Flow product line focuses on replacement mufflers that match OE-style sound characteristics while maintaining practical exhaust flow. For shoppers searching for a Walker muffler for 2011-2017 Chevrolet Silverado 2500 HD or a Walker exhaust muffler for 2018-2019 GMC Sierra 2500 HD, Part Number 21753 is the relevant catalog reference. This part cross-references AP Exhaust 2644 for the same application.

Common Issues This Muffler Can Address

  • Exhaust noise that is louder than factory levels
  • Corrosion-related muffler replacement on aluminized steel systems
  • Damaged or rusted muffler body on HD pickup exhaust
  • Need for a direct-fit replacement with OE-style sound
  • Exhaust service on trucks with offset inlet and outlet routing

Installation Notes

Verify inlet and outlet diameter, offset configuration, and overall length before installation. This muffler uses pipe connection ends and is not reversible or tunable. For welded assemblies, replace all required parts as noted in the fitment data. Confirm vehicle-specific exhaust routing on the Silverado HD or Sierra HD before final assembly.

Quality Assurance

Walker backs Quiet-Flow mufflers with a limited lifetime warranty and a 90-day Safe and Sound guarantee. Part Number 21753 is built for specific applications and supported by Walker’s Quiet-Flow product line standards.

Related reading

This part fits 110 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeLitersCylindersWheel BasePositionNotes
2017ChevroletSilverado 2500 HD—6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 2500 HD—6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 2500 HD—6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 2500 HD—6.0LV8144.2"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 2500 HD—6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDStandard Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDCrew Cab Pickup6.0LV8144.2"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDExtended Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDExtended Cab Pickup6.0LV8144.2"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDExtended Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDStandard Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDStandard Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDCrew Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDExtended Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDCrew Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDCrew Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDStandard Cab Pickup6.0LV8144.2"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDCrew Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDExtended Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 2500 HDStandard Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDStandard Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDExtended Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDCrew Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDExtended Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDCrew Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDCrew Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDStandard Cab Pickup6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDStandard Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDStandard Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDExtended Cab Pickup6.0LV8158.1"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDExtended Cab Pickup6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2017GMCSierra 3500 HDCrew Cab Pickup6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016ChevroletSilverado 2500 HD—6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016GMCSierra 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016GMCSierra 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016GMCSierra 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2016GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015ChevroletSilverado 2500 HD—6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015GMCSierra 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015GMCSierra 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015GMCSierra 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2015GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014ChevroletSilverado 2500 HD—6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014ChevroletSilverado 2500 HD—6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014ChevroletSilverado 2500 HD—6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014GMCSierra 2500 HD—6.0LV8153.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014GMCSierra 2500 HD—6.0LV8133.6"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014GMCSierra 2500 HD—6.0LV8167.7"N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2014GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013GMCSierra 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013GMCSierra 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013GMCSierra 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2013GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012GMCSierra 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012GMCSierra 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012GMCSierra 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2012GMCSierra 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011ChevroletSilverado 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011ChevroletSilverado 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011ChevroletSilverado 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011ChevroletSilverado 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011ChevroletSilverado 3500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011ChevroletSilverado 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011GMCSierra 2500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011GMCSierra 2500 HDCrew Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011GMCSierra 2500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011GMCSierra 3500 HDExtended Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011GMCSierra 3500 HDStandard Cab Pickup6.0LV8—N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow
2011GMCSierra 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 — 2644