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The WALKER 21678 Quiet-Flow® SS Exhaust Muffler is a premium, direct-fit stainless-steel replacement engineered to restore factory-original exhaust performance for the 2009–2015 Honda Pilot (Left Side). Featuring 100% stainless-steel construction, this Quiet-Flow® SS muffler outlasts traditional aluminized units and offers superior corrosion resistance.
Its OE-style domed heads, louvered tubes, and acoustically tuned chambers deliver smooth, factory-correct sound quality, while mechanically joined tubes and spun-locked heads reduce distortion during thermal expansion. Designed for a precise fit, this muffler installs easily with OE-style hangers and requires no welding or fabrication.
100% Stainless-Steel Body for maximum corrosion resistance
Direct-Fit Bolt-On Replacement with OE-style mounting points
OE-Style Acoustic Tuning for quiet, refined exhaust sound
Durable Construction with mechanically joined internal tubes
Internal Drainage System reduces moisture to extend service life
Acoustic & Flow Tested for OE-level performance
Backed by Walker’s Limited Lifetime Warranty
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Body Material | Stainless Steel |
| Inlet Type | Pipe Connection |
| Outlet Type | Tip |
| Inlet Diameter | 1.750 in |
| Outlet Diameter | 2.250 in |
| Inlet Location | Offset |
| Outlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Height | 5.500 in |
| Body Length | 14.000 in |
| Body Width | 11.000 in |
| Overall Length | 28.500 in |
| Inlet Offset | 3.750 in |
| Reversible | Yes |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
3.5L V6 (3471cc) → 2009–2015
Position: Left
Quantity Required: 1
Direct-fit design—no cutting or welding required
Replace clamps or gaskets as needed for optimal sealing
Stainless steel body ensures extended service life
Walker Quiet-Flow® SS products include a limited lifetime warranty
Engineered for OE sound and factory-correct backpressure
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).
