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The WALKER 21919 Quiet-Flow® SS Exhaust Muffler is a premium, OE-style stainless-steel replacement designed for 2014–2018 Chevrolet Silverado 1500 and GMC Sierra 1500 models equipped with 4.3L and 5.3L engines. Built using 100% stainless-steel construction, it provides outstanding corrosion resistance and long-lasting durability versus aluminized steel mufflers.
Featuring OE-style domed heads, louvered tubes, and precision acoustic tuning, the 21919 delivers a refined factory-correct exhaust tone. Internal partitions and mechanically joined tubes allow expansion and contraction during heat cycling without distortion, ensuring reliability under heavy-duty use. With OE-style hangers and pipe routing, the muffler installs quickly and accurately with no welding required.
Engineered for superior flow, durability, and quiet performance, this Quiet-Flow® SS muffler restores smooth and efficient exhaust operation in hardworking GM full-size trucks.
100% Stainless-Steel Body for exceptional corrosion protection
Direct-Fit Bolt-On Installation using OE-style hangers and pipe routing
OE-Style Acoustic Engineering delivers premium factory-like sound
Mechanically Joined Internal Tubes & Spun-Locked Heads for durability
Internal Drainage System reduces moisture and extends service life
Flow-Tested & Acoustically Tuned to meet OE performance standards
Backed by Walker’s Limited Lifetime Warranty and 90-Day Safe & Sound® Guarantee
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Natural |
| Body Material | Stainless Steel |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.625 in |
| Outlet Inside Diameter | 2.625 in |
| Inlet Location | Offset |
| Outlet Location | Center |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Height | 5.500 in |
| Body Length | 21.000 in |
| Body Width | 11.000 in |
| Overall Length | 25.000 in |
| Inlet Offset | 3.500 in |
| Reversible | No |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
(One muffler required per vehicle unless otherwise noted.)
5.3L V8 (5328cc / 325 cid) → 2014–2018
4.3L V6 (262 cid) → 2014–2018
5.3L V8 (5328cc / 325 cid) → 2014–2018
4.3L V6 (262 cid) → 2014–2018
Designed for direct bolt-on replacement—no modifications required
Replace exhaust clamps or seals as needed for best fit
Stainless-steel construction greatly extends muffler lifespan
Restores OE backpressure and sound characteristics
Protected by Walker’s limited lifetime warranty
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
