Race-Ready Mustang Sound with a Blacked-Out Look for 2018-2020 GT and Bullitt
The Corsa Performance COR21039BLK Sport Axle-Back Exhaust is engineered for 2018-2020 Ford Mustang GT and Bullitt owners who want maximum presence without a full cat-back investment. Using Corsa's patented RSC Technology, the COR21039BLK eliminates cabin drone at cruising speeds while delivering a deep, aggressive 5.0L Coyote V8 tone at wide-open throttle. The 3-inch mandrel-bent T304 stainless steel construction is built to last, and the 4-inch black PVD Pro-Series tips add a factory-aggressive, blacked-out finishing touch. Installation is a clean bolt-on with no cutting, welding, or tuning required.
Key Features
- Corsa RSC Technology eliminates interior drone on 2018-2020 Mustang GT
- 4-inch black PVD Pro-Series tips for a stealthy, aggressive appearance
- 3-inch mandrel-bent T304 stainless steel piping
- Bolt-on Sport axle-back installation with no modifications required
- Sport sound level: louder than stock, refined for daily driving
- Limited lifetime warranty, made in the USA
Vehicle Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2018-2020 | Ford | Mustang | GT |
| 2018-2020 | Ford | Mustang | GT Premium |
| 2020 | Ford | Mustang | Bullitt |
Specifications
| Detail | Value |
|---|---|
| Part Number | COR21039BLK |
| MPN | COR21039BLK |
| Finish | Black PVD |
| Tip Size | 4.0 inch Black PVD Pro-Series |
| Pipe Diameter | 3.0 inch |
| Material | T304 Stainless Steel |
| System Type | Sport Axle-Back |
| Fitment | 2018-2020 Ford Mustang GT 5.0L V8 |
| Prop 65 | Yes |
| Warranty | Limited Lifetime |
| Made In | USA |
| UPC | 847442021493 |
What's Included
- Sport axle-back muffler assembly
- 4-inch Black PVD Pro-Series exhaust tips
- OEM-style hangers and clamps
- Corsa installation instructions
About Corsa Performance
Founded in 1989 in Berea, Ohio, Corsa Performance designs and manufactures drone-free performance exhaust systems in the USA. Corsa's patented RSC Technology and T304 stainless steel construction are backed by a limited lifetime warranty on every system.
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Frequently Asked Questions
What is the COR21039BLK?The COR21039BLK is a Corsa Performance Sport axle-back exhaust with 4-inch black PVD Pro-Series tips, designed for the 2018-2020 Ford Mustang GT and Bullitt 5.0L V8. It uses patented RSC Technology for an aggressive sound without interior drone.
What Mustang models does the COR21039BLK fit?The COR21039BLK fits the 2018-2020 Ford Mustang GT, GT Premium, and 2020 Mustang Bullitt with the 5.0L Coyote V8. It is not compatible with EcoBoost four-cylinder models.
Is COR21039BLK an axle-back or cat-back system?The COR21039BLK is an axle-back exhaust system, meaning it replaces only the rear section of the exhaust behind the rear axle. If you want maximum flow improvement, consider the COR21042BLK cat-back system.
Will the black tips fade or rust?The 4-inch tips are finished with black PVD coating, a physical vapor deposition process that is highly resistant to heat, UV exposure, and corrosion under normal use conditions.
Does the COR21039BLK require a tune?No. The COR21039BLK is a bolt-on axle-back system. No engine tune or ECU changes are required.
Does Corsa offer a warranty on the COR21039BLK?Yes. Corsa Performance backs all of their exhaust systems, including the COR21039BLK, with a limited lifetime warranty covering manufacturing defects.
How does Sport sound level compare to Xtreme?The Sport level is Corsa's moderate sound tier, noticeably louder and more resonant than stock while remaining comfortable for extended highway driving. Xtreme is Corsa's loudest, most aggressive sound level for track-oriented builds.
Is this exhaust legal in California?This exhaust is not CARB compliant. It is intended for off-highway use in California and is street legal in all other US states.
Installation Instructions
- Safely raise the Mustang on a lift or with jack stands and allow the exhaust to cool.
- Disconnect the factory exhaust behind the rear axle at the existing connection point.
- Remove the stock axle-back mufflers from the factory hangers.
- Hang the Corsa muffler assembly onto the OEM hanger locations.
- Align the 4-inch black PVD tips so they are centered and even in the rear valance cutouts.
- Tighten all connection clamps securely.
- Start the engine and check for exhaust leaks before driving.
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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