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Walker 21391 Exhaust Muffler
| Brand | Walker 21391 |
|---|---|
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Body Width | 9 |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 2.5 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 31.37 |
| Body Height | 7 |
| Body Length | 24 |
| Body Material | Stainless steel |
| Finish | Aluminized |
| Inlet 1 Type | 3 bolt welded flange |
| Inlet Configuration | Offset |
| Inlet Offset | 2 |
| Inlet Type | 3 bolt welded flange |
| Muffler Type | Combination |
| Outlet 1 Inside Diameter | 2.5 |
| Outlet 1 Type | Pipe connection |
| Outlet Configuration | Offset |
| Outlet Type | Pipe connection |
| Product line | Quiet-Flow SS |
| Fits | Chevrolet and GMC · 12 vehicles |
100% stainless steel. Resists corrosion for long service life.
Precision fit. OE-style sound with superior flow.
Oval combination design. Delivers a balanced muffler layout.
Cross-references OSC 2191 for the same application. See all 1.
Walker Quiet-Flow SS Muffler for Astro and Safari
Walker Quiet-Flow SS muffler Part Number 21391 is a specific-fit exhaust muffler built for select Chevrolet Astro and GMC Safari applications. It combines stainless-steel body construction with an OE-style sound profile and a precision-fit layout for direct replacement service.
Key Features
- Specific-fit exhaust muffler for select 2000-2005 Chevrolet Astro and GMC Safari models
- 100% stainless-steel body construction for corrosion resistance
- Oval muffler shape with a combination muffler design
- Offset inlet and offset outlet configuration for application-specific routing
- 3-bolt welded flange inlet for secure exhaust connection
- 2.5-inch inlet and 2.5-inch outlet inside diameter
- Walker Quiet-Flow SS product line focused on fit, flow, and OE-style sound
- Part Number 21391
Product Details
Walker Quiet-Flow SS Part Number 21391 is engineered as a direct replacement exhaust muffler for 2000-2005 Chevrolet Astro and 2000-2005 GMC Safari vehicles. The oval stainless-steel body measures 24 inches long, 7 inches high, and 9 inches wide, with an overall length of 31.37 inches. Its offset inlet and outlet layout, along with the 3-bolt welded flange inlet, supports application-specific exhaust routing while maintaining a factory-style sound character. This muffler is a practical choice for drivers searching for a 2000-2005 Chevrolet Astro muffler replacement, a GMC Safari exhaust muffler, or Walker 21391 fitment details.
The Quiet-Flow SS line is Walker’s stainless-steel muffler family for domestic and import vehicles, built around precision fitment and controlled exhaust flow. For buyers comparing OE-style replacement options, Part Number 21391 provides a direct-fit solution for the Astro and Safari platform without changing the vehicle’s original exhaust layout.
Common Issues This Muffler Can Address
- Rust-through or corrosion in the original muffler body
- Exhaust noise from a damaged or leaking muffler
- Poor fitment after previous exhaust repairs
- Restricted exhaust flow caused by internal muffler deterioration
- Need for an OE-style replacement on Astro and Safari applications
Installation Notes and Tips
Verify the inlet and outlet configuration, flange style, and overall dimensions before installation. This muffler is not reversible or tunable, so orientation matters during exhaust system replacement. For welded assemblies, replace all required parts to maintain proper alignment and sealing. Confirm compatibility with your specific 2000-2005 Chevrolet Astro or GMC Safari exhaust setup before final installation.
Quality Assurance
Walker Quiet-Flow SS mufflers are built with stainless-steel construction and application-specific fitment for consistent replacement quality. This part is listed for premium service applications and includes limited lifetime warranty coverage per the fitment notes provided for the Astro and Safari applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Chevrolet | Astro | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2005 | GMC | Safari | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Chevrolet | Astro | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | GMC | Safari | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Chevrolet | Astro | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | GMC | Safari | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Chevrolet | Astro | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | GMC | Safari | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Chevrolet | Astro | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | GMC | Safari | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2000 | Chevrolet | Astro | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2000 | GMC | Safari | 4.3L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
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