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The WALKER 21544 Quiet-Flow® SS Exhaust Muffler is a premium, direct-fit replacement engineered for Jeep Commander and Grand Cherokee models equipped with 3.7L, 4.7L, and 5.7L engines. Built with 100% stainless-steel construction, it delivers superior corrosion resistance and a significantly longer service life than typical aluminized mufflers.
OE-style domed heads, louvered tubes, and precisely engineered internal partitions ensure accurate acoustic control and a refined, factory-correct exhaust note. Mechanically joined tubes and spun-locked heads allow for thermal expansion without distortion, ensuring durability even under extreme operating conditions.
With OE-style pipe routing and mounting geometry, this Quiet-Flow® SS muffler installs easily without welding and restores proper exhaust flow, sound characteristics, and system integrity.
100% Stainless-Steel Construction for maximum corrosion resistance and longevity
Direct-Fit Design with OE-style brackets and pipe routing
Premium OE-Style Sound Control using louvered tubes and domed heads
Mechanically Joined Tubes & Spun-Locked Heads enhance durability under heat cycles
Internal Drainage System helps reduce moisture accumulation
Flow & Acoustically Tested to deliver OE-grade performance and tone
Backed by Walker’s Limited Lifetime Warranty and 90-Day Safe & Sound® Guarantee
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Body Material | Stainless Steel |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.500 in |
| Outlet Inside Diameter | 2.250 in |
| Inlet Location | Offset |
| Outlet Location | Center |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Height | 5.500 in |
| Body Length | 27.000 in |
| Body Width | 11.000 in |
| Overall Length | 32.000 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.)
5.7L V8 (345 cid) → 2006–2010
4.7L V8 (287 cid) → 2006–2009
3.7L V6 (226 cid) → 2006–2010
5.7L V8 (345 cid) → 2005–2010
3.7L V6 (226 cid) → 2005–2010
4.7L V8 (287 cid) → 2005–2009
Direct-fit bolt-on design—no welding required
Matches OE sound level and exhaust backpressure
Replace gaskets and clamps for best results
Stainless-steel body offers significantly extended service life
Includes Walker’s limited lifetime warranty and 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).
