Walker 21405 Exhaust Muffler
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Walker
 Quiet-Flow SS

Walker 21405 Exhaust Muffler

Brand Walker 21405
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2.5
Body Width 9.75
Inlet Quantity 1
Outlet Inside Diameter 2.25
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 21
Body Height 4.25
Body Length 18
Body Material Stainless steel
Finish Aluminized
Inlet 1 Inside Diameter 2.5
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.875
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Inside Diameter 2.25
Outlet 1 Type Pipe connection
Outlet Configuration Center
Outlet Type Pipe connection
Product line Quiet-Flow SS
Fits Chevrolet and GMC · 22 vehicles

100% stainless steel. Built for corrosion resistance and long service life.

Precision fit. Helps simplify installation with an OE-style replacement design.

OE-style sound. Delivers a refined exhaust note without harshness.

Cross-references 15722094 for the same application. See all 1.

$100.84Free shipping
In stock · usually ships same day before 1pm CST
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Order total $100.84
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker Quiet-Flow SS Muffler for S10 and Sonoma

Walker Quiet-Flow SS muffler Part Number 21405 is a direct-fit exhaust muffler for select Chevrolet S10 and GMC Sonoma applications. It uses 100% stainless-steel construction for the body and is built for OE-style sound, precise fitment, and steady exhaust flow.

Key Features

  • Specific-fit exhaust muffler for select 1996-2002 Chevrolet S10 and GMC Sonoma models
  • 100% stainless-steel body construction for corrosion resistance
  • Oval combination muffler design with offset inlet and center outlet
  • 2.5-inch inlet inside diameter and 2.25-inch outlet inside diameter
  • Overall length: 21 inches; body length: 18 inches; body width: 9.75 inches; body height: 4.25 inches
  • Walker Quiet-Flow SS product line focuses on OE-style sound and precision fit

Detailed Description

Walker 21405 is part of the Quiet-Flow SS line, a stainless-steel muffler family built for direct replacement on broad domestic and import coverage. For this application, the muffler uses an oval body with a 2.5-inch pipe connection inlet, a 2.25-inch pipe connection outlet, an offset inlet configuration, and a center outlet configuration. The design supports a factory-like exhaust tone while maintaining the fit and flow characteristics expected in a replacement muffler for Chevrolet S10 and GMC Sonoma trucks.

This part cross-references Monroe Shocks & Struts (e.g., 15722094) for the same application.

Vehicle Fitment

  • Fits 2000-2002 Chevrolet S10, N/A, Premium; with Sport Package; Quiet-Flow SS
  • Fits 2000-2002 GMC Sonoma, N/A, Premium; with Sport Package; Quiet-Flow SS
  • Fits 1996-1999 Chevrolet S10, N/A, Premium; with High Rider Package; Quiet-Flow SS
  • Fits 1996-1999 GMC Sonoma, N/A, Premium; with High Rider Package; Quiet-Flow SS

Common Replacement Uses

  • Replacement for a rusted or perforated factory muffler
  • Correction for exhaust noise that has become louder than stock
  • Service part for damaged muffler housings on S10 and Sonoma trucks
  • Direct-fit repair when the original muffler no longer seals or flows properly

Installation Notes

Verify inlet and outlet diameters, offset and center configuration, and overall length before installation. This muffler uses pipe connections and is not reversible or tunable. For welded exhaust assemblies, replace all required related parts during service to maintain proper alignment and sealing.

Quality Assurance

Walker Quiet-Flow SS mufflers are built with stainless-steel construction and engineered for precision fit and OE-style sound. Part Number 21405 is intended for the listed Chevrolet S10 and GMC Sonoma applications and follows Walker’s direct-fit replacement approach.

Related reading

This part fits 22 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelDrive TypeLitersCylindersWheel BasePositionNotes
2002ChevroletS104WD4.3LV6122.9"N/APremium; with Sport Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2002GMCSonoma4WD4.3LV6122.9"N/APremium; with Sport Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2001ChevroletS104WD4.3LV6122.9"N/APremium; with Sport Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2001GMCSonoma4WD4.3LV6122.9"N/APremium; with Sport Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2000ChevroletS104WD4.3LV6122.9"N/APremium; with Sport Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2000GMCSonoma4WD4.3LV6122.9"N/APremium; with Sport Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1999ChevroletS104WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1999ChevroletS104WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1999GMCSonoma4WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1999GMCSonoma4WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1998ChevroletS104WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1998ChevroletS104WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1998GMCSonoma4WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1998GMCSonoma4WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1997ChevroletS104WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1997ChevroletS104WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1997GMCSonoma4WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1997GMCSonoma4WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1996ChevroletS104WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1996ChevroletS104WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1996GMCSonoma4WD4.3LV6108.3"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
1996GMCSonoma4WD4.3LV6122.9"N/APremium; with High Rider Package; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
15722094