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The WALKER 18942 SoundFX® Exhaust Muffler is a direct-fit replacement engineered to restore OE-style performance and sound for GM minivans equipped with 3.4L, 3.5L, and 3.9L V6 engines. Manufactured from 100% aluminized steel, this muffler offers superior corrosion resistance and extends service life compared to standard low-carbon steel alternatives.
OE-style louvered tubes help reduce radiated noise for a smoother, factory-correct exhaust tone. Internal partitions and mechanically joined tubes allow for controlled expansion and contraction under temperature cycles, reducing distortion and improving durability. With OE-style pipe routing and mounting geometry, installation is straightforward and requires no welding.
Designed and tested to maintain optimal exhaust flow and backpressure, the 18942 ensures long-lasting reliability and quiet performance for daily-driven vehicles.
Aluminized Steel Construction provides excellent corrosion resistance
Direct-Fit Bolt-On Installation with OE-style routing and connections
OE-Style Louvered Tubes ensure quiet, factory-level sound quality
Mechanically Joined Tubes & Spun-Locked Heads increase durability
Internal Drainage System helps prevent moisture buildup
Engineered & Tested to match OE exhaust performance and longevity
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Body Material | Steel |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.250 in |
| Outlet Inside Diameter | 2.250 in |
| Inlet Location | Offset |
| Outlet Location | Center |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Height | 4.250 in |
| Body Length | 28.000 in |
| Body Width | 8.813 in |
| Overall Length | 32.000 in |
| Inlet Offset | 2.625 in |
| Reversible | No |
| Tunable | No |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
(One muffler required per vehicle unless otherwise noted.)
3.9L V6 (3880cc / 237 cid) → 2007
3.5L V6 (213 cid), FWD → 2005–2006
3.5L V6 (213 cid), AWD → 2005–2006
3.9L V6 (3880cc / 237 cid) → 2007–2008
3.5L V6 (213 cid), FWD → 2005–2006
3.5L V6 (213 cid) → 2005–2006
3.4L V6 (207 cid), FWD → 2002–2005
3.4L V6 (207 cid), FWD → 2002–2004
3.9L V6 (3880cc / 237 cid) → 2007–2009
3.4L V6 (207 cid), FWD → 2002–2005
3.5L V6 (213 cid), FWD → 2005–2006
3.5L V6 (213 cid) → 2005–2006
3.5L V6 (213 cid), FWD → 2005–2006
3.5L V6 (213 cid), AWD → 2005–2006
3.9L V6 (3880cc / 237 cid) → 2007
Direct-fit design simplifies installation and aligns with OE hangers
Replace clamps and gaskets for optimal sealing
Designed to restore proper exhaust tone and reduce cabin noise
Aluminized steel resists corrosion for extended service life
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).
