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The WALKER 18986 SoundFX® Exhaust Muffler is a premium direct-fit replacement engineered to restore original exhaust tone, performance, and flow for Jeep Commander and Grand Cherokee models. Built from 100% aluminized steel, this muffler provides superior corrosion resistance and long-lasting durability compared to standard low-carbon steel units.
With its internal drainage system, louvered tubes, and mechanically joined internal components, this muffler is engineered to deliver OE-style sound quality and extended service life. The 18986’s direct-fit design includes OE-style pipe routes for quick installation with no welding or special fabrication required.
This SoundFX® muffler is reverse-flow compatible, giving installers flexibility when routing the system while still maintaining proper fitment and performance.
Aluminized Steel Construction for strong corrosion resistance
Direct-Fit Bolt-On Replacement — no welding required
OE-Style Louvered Tubes for factory-correct sound
Internal Drainage System reduces moisture buildup
Spun-Locked Heads & Reinforced Joints for long-term durability
Reversible Design for flexible installation
Engineered & Tested for extended service life
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Body Material | Steel |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.500 in |
| Outlet Inside Diameter | 2.250 in |
| Inlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Location | Center |
| 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 | Yes |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
(One muffler required per vehicle unless noted otherwise.)
3.7L V6 (226 cid) → 2006–2010
4.7L V8 (287 cid) → 2006–2009
5.7L V8 (345 cid) → 2006–2010
3.7L V6 (226 cid) → 2005–2010
4.7L V8 (287 cid) → 2005–2009
5.7L V8 (345 cid) → 2005–2010
Direct-fit bolt-on muffler; verify hanger reuse or replacement as needed
Ensure proper system alignment before tightening clamps
Muffler is reversible for installation flexibility
Designed for OE-style backpressure and tone
Always inspect gaskets, clamps, and rubber isolators before installation
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).
