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The Walker SoundFX® 18104 universal muffler is engineered to deliver long-lasting performance, a clean appearance, and balanced acoustics for a wide range of older GM and domestic applications. Featuring durable aluminized steel and mechanical interior joints, this muffler withstands heat cycles and corrosion better than low-carbon steel alternatives.
With expandable bushings and a universal-fit design, the 18104 allows flexible installation for custom exhaust work. Ideal for restorations, repairs, and retrofits requiring factory-style sound quality.
Corrosion-Resistant Aluminized Steel for extended service life
Internal Drainage System that reduces moisture and corrosion buildup
Durable Mechanical Joints designed to handle thermal expansion
Universal Fitment with expandable bushings for custom exhaust fabrication
OE-Style Louvered Tubes deliver original-equipment sound quality
Spun-Locked Heads & Spot Welds for structural integrity
Tested & Validated for performance and longevity
| Specification | Value |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Inlet Inside Diameter | 2.250 in |
| Outlet Inside Diameter | 2.000 in |
| Body Height | 4.250 in |
| Body Length | 20.000 in |
| Body Width | 8.813 in |
| Overall Length | 28.000 in |
| Inlet Location | Offset |
| Outlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Quantity | 2 |
| Hanger Included | No |
| Reversible | No |
| Fitment Type | Universal |
| Body Material | Steel |
| Grade Type | Premium |
| Part Description | SoundFX Universal Muffler |
| Inlet Offset | 2.625 in |
(Universal Part — Listed Vehicles Are Examples Of Known Applications)
Apollo (1975) — 5.7L V8 350
Skylark (1975–1979) — 5.0L / 5.7L V8
Camaro (1975–1992) — 2.8L V6, 3.1L V6, 4.4L V8, 5.0L V8, 5.7L V8
Nova (1975–1979) — 4.3L V8, 5.0L V8, 5.7L V8
Omega (1975–1979) — 5.0L & 5.7L V8
Firebird (1977–1992) — 2.8L V6, 3.1L V6, 5.0L V8, 5.7L V8
Phoenix (1977–1979) — 5.0L / 5.7L V8
Ventura (1975–1977) — 5.0L / 5.7L V8
Universal part — fabrication or welding is required
Designed with expandable bushings for flexible fitment
Ensure proper alignment of offset inlet and dual outlets
No hangers included — install new hangers or adapt existing ones
Recommended for custom exhaust systems, classic vehicle restoration, and retrofits
Must verify available space and orientation before installation
Not reversible — install with offset orientation as designed
Professional installation strongly recommended due to universal fitment
Check clearance around suspension, body panels, and heat shields
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).
