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The WALKER 21607 Quiet-Flow® SS Exhaust Muffler is a premium, stainless-steel, direct-fit replacement engineered to restore OE-style performance and sound on 2007–2011 Dodge Nitro (3.7L V6) models. As the only broad-market muffler built with 100% stainless-steel construction, this Quiet-Flow® SS unit provides superior resistance to corrosion and exceptional durability.
OE-style internal acoustics, louvered tubes, and precision-engineered chambers ensure smooth, factory-correct sound characteristics. The Quiet-Flow® SS design also incorporates mechanically joined tubes and spun-locked heads for long-lasting performance and minimized distortion under thermal cycling.
100% Stainless-Steel Body for superior corrosion resistance
Direct-Fit Installation with OE-style routing and mounting points
OE-Style Acoustic Engineering for quiet, factory-correct exhaust sound
Durable Construction with mechanically joined tubes and spun-locked heads
Internal Drainage System reduces moisture build-up for extended 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 | Pipe Connection |
| Inlet Diameter | 2.500 in |
| Outlet Diameter | 2.250 in |
| Inlet Location | Center |
| Outlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Height | 5.500 in |
| Body Length | 25.000 in |
| Body Width | 11.000 in |
| Overall Length | 37.000 in |
| Reversible | No |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
3.7L V6 (226 cid) → 2007–2011
Position: Rear Muffler
Drive: RWD / 4WD (fits both)
Quantity Required: 1
Designed as a direct-fit replacement—no welding required
Reuse or replace exhaust clamps and gaskets as needed
Stainless-steel construction provides extended service life
Includes Walker’s limited lifetime warranty and 90-Day Safe & 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).
