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The WALKER 21398 Exhaust Resonator is engineered to deliver OE-style sound, performance, and exhaust flow for a variety of GM sedans. Built with durable aluminized steel, this resonator helps resist corrosion while providing a long service life. Its precision-tuned design reproduces factory exhaust tone by using OE-style louvered tubes (where applicable) to reduce radiated noise and harmonics.
Featuring thick OE-style flanges, brackets, and hardware, the 21398 is designed for strength and durability. While this resonator is built to fit specific applications, installation may require custom fabrication or welding, depending on the exhaust setup.
Walker resonators are engineered to match original equipment performance—delivering smooth, refined sound quality and reliable exhaust flow characteristics.
Corrosion-Resistant Aluminized Steel enhances durability
OE-Style Sound Quality using louvered tubes to reduce noise
Customizable Installation may require welding or fabrication
Durable Construction with thick OE-style flanges and strong brackets
Engineered for OE-Level Fitment, Flow, and Acoustic Performance
Designed to Extend Exhaust System Life
| Specification | Detail |
|---|---|
| Shape | Round |
| Finish | Aluminized |
| Body Material | Steel |
| Inlet Type | 2-Bolt Welded Flange |
| Outlet Type | Pipe Connection |
| Inlet Configuration | Center |
| Outlet Configuration | Center |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| Body Height | 4.000 in |
| Body Length | 26.000 in |
| Body Width | 4.000 in |
| Outlet Inside Diameter | 2.250 in |
| Outlet Outside Diameter | 2.250 in |
| Resonator Shape | Round |
| Universal or Specific Fit | Specific |
| Grade Type | Premium |
(Direct-fit applications listed; one resonator required per vehicle.)
Allure — 3.8L V6 (3800cc / 231 cid)
2005–2009
LaCrosse — 3.8L V6 (3800cc / 231 cid)
2005–2009
Impala — 3.8L V6 (3800cc / 231 cid)
2000–2005
Impala — 3.4L V6 (207 cid)
2000–2005
Monte Carlo — 3.4L V6 (207 cid)
2000–2005
Grand Prix — 3.8L V6 (3800cc / 231 cid)
2005–2008
May require welding or custom fabrication depending on vehicle exhaust layout
Designed to match OE-style routing and sound characteristics
Inspect all gaskets, clamps, and hangers before installation
Ensure proper alignment to avoid vibration and backpressure issues
Built for long service life with OE-style structural reinforcements
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).
