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The WALKER 21744 Quiet-Flow® SS Exhaust Muffler delivers OE-style sound, premium durability, and direct-fit installation for Subaru Outback models. Built with a 100% stainless-steel muffler body, this unit provides exceptional corrosion resistance and longer service life compared to aluminized alternatives.
Designed with OE-style brackets, hangers, and pipe routing, the Quiet-Flow® SS ensures a seamless bolt-on installation without the need for welding. Engineered with louvered tubes and domed heads, it offers refined acoustic control while maintaining optimal exhaust flow.
Each muffler undergoes rigorous acoustic and flow testing to ensure dependable, factory-correct performance. Protected by Walker’s limited lifetime warranty and 90-Day Safe and Sound® Guarantee, this muffler is a top-tier replacement solution.
100% Stainless-Steel Muffler Body for superior rust and corrosion resistance
Direct-Fit Bolt-On Design with OE-style hangers and brackets
Premium Noise Control through louvered tubing and domed end caps
Durable Construction with mechanically joined tubes and spun-locked heads
Internal Moisture Drainage System reduces corrosion risk
Acoustic & Flow Validated for OE-quality sound
Backed by Walker’s Limited Lifetime Warranty
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Natural |
| Body Material | Stainless Steel |
| Inlet Type | 2 Bolt Welded Flange |
| Outlet Type | Tip |
| Inlet Inside Diameter | — (Flange Style) |
| Outlet Outside Diameter | 1.750 in |
| Body Height | 7.000 in |
| Body Length | 13.000 in |
| Body Width | 9.000 in |
| Inlet Location | Offset |
| Outlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Inlet Offset | 1.625 in |
| Overall Length | 23.375 in |
| Reversible | No |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
2010–2012
2.5L H4 2458cc
Qty: 1
2010–2015 (Left Position)
3.6L H6 3630cc
Qty: 1
2013–2019
2.5L H4 2498cc / 152 cid
Qty: 1
Direct-fit design—no welding or fabrication required
Stainless-steel construction ensures maximum durability
Engineered for OE-style acoustics and performance
Covered by Walker’s limited lifetime warranty and 90-Day Safe and Sound® Guarantee
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).
