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The WALKER 18451 SoundFX® Exhaust Muffler is an OE-style, direct-fit replacement engineered for 1995–1999 GM mid-size SUVs. Built from 100% aluminized steel, it provides significantly greater durability than low-carbon steel alternatives while delivering reliable acoustic performance and long service life.
Internal mechanically joined tubes, OE-style baffling, and a moisture-reducing drainage system help maintain structural integrity while producing a factory-correct exhaust tone. Designed for easy installation, the 18451 includes OE-style pipe routing and a 3-bolt welded flange for a secure, leak-free connection.
This premium-grade replacement muffler restores original exhaust performance and sound quality for Chevrolet Blazer, GMC Jimmy, and Oldsmobile Bravada models equipped with the 4.3L V6 engine.
Aluminized Steel Construction for corrosion resistance and longevity
Direct-Fit Replacement with OE-style hangers, flanges & pipe routing
Spun-Locked Heads & Mechanically Joined Tubes for structural durability
OE-Style Louvered Tubes for reduced noise and factory-like tone
Internal Drainage System minimizes moisture buildup
Premium Acoustic Control engineered for OE-style performance
Designed & Tested to extend service life and reduce radiated noise
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Body Material | Steel |
| Inlet Type | 3 Bolt Welded Flange |
| Outlet Type | Pipe Connection |
| Inlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Location | Center |
| Outlet Inside Diameter | 2.250 in |
| Outlet Quantity | 1 |
| Body Height | 5.500 in |
| Body Length | 27.000 in |
| Body Width | 11.000 in |
| Overall Length | 32.500 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.)
4.3L V6 (262 cid) → 1995–1999
4.3L V6 (262 cid) → 1995–1999
4.3L V6 (262 cid) → 1996–1999
Direct-fit design with OE-style flange ensures simplified installation
No welding required when matched to factory components
Always inspect exhaust hangers, clamps, and gaskets prior to installation
Designed to restore original backpressure and sound characteristics
Features aluminized steel for rust resistance and extended lifespan
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).
