Product Description
The WALKER 21665 Exhaust Resonator is engineered to restore factory-style exhaust tone, flow characteristics, and performance for select Chevrolet, Pontiac, and Saturn midsize sedans. Designed with OE-style acoustic tuning, this resonator uses louvered internal tubes (where applicable) to reduce radiated noise and deliver a smooth, quiet exhaust note.
Constructed from durable aluminized steel, the 21665 provides effective corrosion resistance and long-lasting service life. Thick OE-style flanges and brackets improve structural integrity, while the resonator’s customizable pipe-connection design may require light fabrication or welding depending on the installation.
Built to meet or exceed original equipment exhaust sound and performance, this resonator is a reliable replacement for restoring smooth exhaust tone on GM Epsilon-platform vehicles.
Key Features
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Aluminized Steel Construction for enhanced corrosion resistance
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OE-Style Louvered Tubes deliver factory-correct acoustic performance
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Thick OE-Style Flanges & Hardware for durability and long service life
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Designed for Excellent Flow Characteristics and reduced exhaust noise
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Flexible Fitment—pipe connection may require fabrication or welding
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Engineered to Match OE Exhaust Performance & Sound
Technical Specifications
| Specification |
Detail |
| Shape |
Round |
| Finish |
Aluminized |
| Body Material |
Steel |
| Body 1 Shape |
Round |
| Resonator Shape |
Round |
| Inlet Type |
Pipe Connection |
| Outlet Type |
Pipe Connection |
| Inlet Inside Diameter |
2.500 in |
| Outlet Inside Diameter |
2.000 in |
| Inlet Configuration |
Center |
| Outlet Configuration |
Center |
| Inlet Quantity |
1 |
| Outlet Quantity |
1 |
| Body Height |
4.000 in |
| Body Length |
27.000 in |
| Body Width |
4.000 in |
| Overall Length |
Listed as 2.000 in (likely data error) |
| Universal or Specific Fit |
Specific |
| Grade Type |
Premium |
Vehicle Compatibility
(One resonator required per vehicle unless otherwise noted.)
Chevrolet
Malibu
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2.4L L4 (2384cc / 145 cid) → 2008–2012
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3.5L V6 (3490cc / 213 cid) → 2008–2010
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3.6L V6 (3564cc / 217 cid) → 2008–2012
Pontiac
G6
Saturn
Aura
Installation & Warranty Notes
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May require welding or fabrication depending on exhaust system design
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Designed to restore OE-style exhaust tone and flow
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Replace gaskets, clamps, and exhaust hangers as needed
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Built with aluminized steel to extend service life
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Ideal for vehicles needing noise reduction and smoother exhaust resonance
