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Xtreme NPP Active Valve Sound for the Sixth-Gen Camaro SS and ZL1
The CORSA 14789 is a 2.75-inch Xtreme valved axle-back exhaust built for the 2016-2021 Chevrolet Camaro SS 6.2L and 2017-2021 ZL1 6.2L configurations equipped with the factory NPP active exhaust valve. CORSA RSC technology is engineered to work with the NPP valve's open and closed modes, delivering Xtreme-level maximum aggressive sound in open mode and a refined Sport character in closed mode. The system exits through quad 4.0-inch polished Pro-Series tips.
Key Features
- CORSA RSC technology at Xtreme level engineered around the factory NPP active valve
- 2.75-inch mandrel-bent T304 stainless steel construction
- Quad 4.0-inch polished Pro-Series exhaust tips
- Xtreme open-mode sound plus refined closed-mode character via NPP valve
- Fits 2016-2021 Camaro SS and 2017-2021 ZL1 with factory NPP valve
- CORSA limited lifetime warranty
- Made in Berea, Ohio, USA
Vehicle Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2016-2021 | Chevrolet | Camaro | SS |
| 2017-2021 | Chevrolet | Camaro | ZL1 |
Specifications
| Detail | Value |
|---|---|
| MPN | 14789 |
| UPC | 847466015274 |
| Pipe Diameter | 2.75 inches |
| System Type | Valved Axle-Back (NPP) |
| Sound Level | Xtreme (open) / Sport (closed) |
| Tip Style | Quad 4.0-inch Polished Pro-Series |
| Exit | Quad Rear Exit |
| Material | T304 Stainless Steel |
| Warranty | Limited Lifetime |
What's Included
- 1x CORSA 14789 Xtreme valved axle-back muffler assembly
- Quad 4.0-inch polished Pro-Series exhaust tips
- All hardware and clamps for bolt-on installation
About CORSA Performance
Founded in 1989 in Berea, Ohio, CORSA Performance invented Reflective Sound Cancellation technology. The 14789 extends NPP valve integration from the Corvette platform to the 6th-gen Camaro, letting SS and ZL1 owners fully leverage driving mode sound control while benefiting from RSC drone elimination. Every system is assembled in the USA with T304 stainless steel and a limited lifetime warranty.
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Frequently Asked Questions
What is the CORSA 14789?The CORSA 14789 is a 2.75-inch Xtreme valved axle-back exhaust for the 2016-2021 Camaro SS and 2017-2021 ZL1 with factory NPP valve, delivering Xtreme sound in open mode and refined character in closed mode through quad polished 4.0-inch Pro-Series tips with RSC technology.
Does the 14789 work with the factory NPP driving modes?Yes. The CORSA 14789 is designed to function with the factory NPP valve. Tour and Comfort modes keep the valve closed for quieter operation; Sport and Track modes open it for full Xtreme output.
What is the difference between 14789 and 14784?The 14784 is a standard Xtreme axle-back without NPP integration for Camaro SS and ZL1 without NPP. The 14789 is specifically engineered to work with the factory NPP valve for driving mode sound control.
What is the difference between 14789 and 14789BLK?Both are the same Xtreme NPP valved axle-back. The 14789 uses polished stainless quad tips; the 14789BLK uses matte black PVD quad tips. Sound and fitment are identical.
Is the 14789 drone-free?Yes. RSC technology eliminates highway drone in both NPP open and closed valve states.
Does this require cutting or welding?No. The CORSA 14789 is a direct bolt-on axle-back at factory mounting points. No cutting or welding required.
Is a tune required?No. The 14789 retains factory catalytic converters and does not alter engine management.
What warranty does the 14789 carry?CORSA provides a limited lifetime warranty on the 14789 against defects in materials and workmanship when purchased from an authorized dealer.
Installation Instructions
- Safely raise and support the Camaro on rated jack stands or a lift
- Allow the factory exhaust to cool completely
- Locate the factory NPP valve assembly
- Disconnect the factory muffler at the NPP valve outlet
- Test-fit CORSA 14789 before tightening any hardware
- Attach to factory hangers and NPP valve outlet with all supplied hardware
- Torque all connections to specification and verify quad tip alignment
- Start engine, cycle NPP modes, and inspect all connections for leaks
Prop 65 Warning: This product can expose you to chemicals including nickel compounds, which are known to the State of California to cause cancer, and carbon monoxide, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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