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The Walker Quiet-Flow® SS 21690 muffler provides a premium stainless-steel construction designed for long-lasting performance, OE-style sound, and trouble-free installation. Engineered with internal drainage systems, mechanically joined tubes, and OE-style louvered acoustics, this muffler enhances durability while reducing noise output.
Its direct-fit design ensures precise alignment with factory exhaust systems on compatible Chevrolet Equinox and GMC Terrain models, offering superior corrosion resistance and long service life compared to aluminized alternatives.
100% Stainless-Steel Body for exceptional corrosion resistance
OE-Style Fitment with factory-type hangers and routing
Improved Acoustic Control using OE-style louvered tubes & domed heads
Durable Construction – spun-locked heads and internal joints resist distortion
Direct-Fit Bolt-On Design with no welding required
Lifetime Warranty with Walker’s Safe & Sound® Guarantee
| Specification | Detail |
|---|---|
| Shape | Oval |
| Finish | Aluminized |
| Inlet Type | Pipe Connection |
| Outlet Type | Pipe Connection |
| Body Height | 4.250 in |
| Body Length | 15.000 in |
| Body Width | 8.810 in |
| Overall Length | 19.000 in |
| Inlet Outside Diameter | 2.250 in |
| Inlet Location | Offset |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 2.250 in |
| Outlet Quantity | 1 |
| Material | Stainless Steel Body |
| Hanger Included | No |
| Reversible | Yes |
| Tunable | No |
| Fitment | Specific |
| Grade Type | Premium |
| Inlet Offset | 2.625 in |
Equinox (2018–2024)
Front • 1.5L L4 (1490cc / 91 cid)
Equinox (2010–2017)
Front • 2.4L L4 (2384cc / 145 cid)
Terrain (2018–2024)
Front • 1.5L L4 (1490cc / 91 cid)
Terrain (2010–2017)
Front • 2.4L L4 (2384cc / 145 cid)
Direct-fit bolt-on installation — designed to attach to factory exhaust pipes
No welding required, but professional installation is recommended
Verify orientation before installation — muffler is reversible, but outlet/inlet alignment must match OE routing
Hangers NOT included — reuse original hangers or replace if worn
Inspect gaskets and flange hardware; replace if rusted or leaking
Penetrating oil recommended for older or corroded fasteners
Ensure proper clearance around heat shields and suspension components after installation
Designed for front muffler position on compatible models
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).
