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Sport-Tuned Coyote V8 Sound from the Full System Back on 2018-2020 Mustang GT
The Corsa Performance COR21042 Sport Cat-Back Exhaust gives your 2018-2020 Ford Mustang GT and Bullitt a complete exhaust upgrade from the converters back, featuring Corsa's patented RSC Technology for a bold, resonant Coyote V8 tone without the highway drone that ruins long drives. The 3-inch mandrel-bent T304 stainless steel piping flows unrestricted to the dual rear exit mufflers, finished with polished 4-inch Pro-Series tips for a clean, premium appearance. The COR21042 installs bolt-on with zero cutting, welding, or tuning. If you want the complete Corsa Sport sound experience on your S550 Mustang, this is the system.
Key Features
- Corsa RSC Technology delivers Sport-level Coyote V8 sound, drone-free
- 3-inch mandrel-bent T304 stainless steel cat-back system
- Dual rear exit with polished 4-inch Pro-Series tips
- Complete bolt-on installation, no tune or welding needed
- 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 | COR21042 |
| MPN | COR21042 |
| Finish | Polished Stainless |
| Tip Size | 4.0 inch Polished Pro-Series |
| Pipe Diameter | 3.0 inch |
| Material | T304 Stainless Steel |
| System Type | Sport Cat-Back |
| Exit | Dual Rear Exit |
| Fitment | 2018-2020 Ford Mustang GT 5.0L V8 |
| Prop 65 | Yes |
| Warranty | Limited Lifetime |
| Made In | USA |
| UPC | 847442021509 |
What's Included
- Complete Sport cat-back exhaust system
- Polished 4-inch Pro-Series tips (dual)
- OEM-compatible hangers and hardware
- Corsa installation instructions
About Corsa Performance
Corsa Performance, founded in 1989 in Berea, Ohio, is the inventor of RSC Technology and America's leading manufacturer of drone-free performance exhaust systems. Every Corsa system is made in the USA from T304 stainless steel and backed by a limited lifetime warranty.
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Frequently Asked Questions
What is the COR21042?The COR21042 is a Corsa Performance Sport cat-back exhaust system for the 2018-2020 Ford Mustang GT and Bullitt 5.0L V8. It uses 3-inch T304 stainless steel tubing and patented RSC Technology to deliver a drone-free Sport sound, finished with polished 4-inch dual Pro-Series tips.
What is the difference between COR21042 and COR21040?Both are full cat-back systems for the 2018-2020 Mustang GT. The COR21042 is the Sport sound level tuned specifically for that trim, while the COR21040 is the Xtreme/standard cat-back. Check the Corsa fitment chart for the exact sound character differences between the two.
Does the COR21042 work with a Mustang that has active exhaust?Check your vehicle's factory exhaust configuration. For Mustangs without the factory active exhaust option, the COR21042 installs as a direct bolt-on. Verify Corsa fitment notes for active valve compatibility on your model year.
Does the COR21042 drone at highway speeds?No. Corsa's RSC Technology specifically eliminates the low-frequency resonance that produces interior drone. The COR21042 is designed to be aggressive under throttle and refined at cruise.
Is installation straightforward for a DIY build?Yes. The COR21042 is a direct bolt-on using factory mounting points. Most experienced DIY installers complete the job in two to four hours with basic hand tools.
Does the COR21042 have a warranty?Yes. Corsa Performance covers the COR21042 with a limited lifetime warranty against defects in materials and workmanship.
Is the COR21042 California street legal?No. This system is not CARB compliant and is designated for off-highway use in California. It is street legal in all other US states.
Will the COR21042 affect fuel economy?Improved exhaust flow can marginally improve efficiency under some driving conditions, but fuel economy effects are negligible compared to other performance modifications. The primary benefit is sound enhancement and potential slight power gains.
Installation Instructions
- Safely support the Mustang on a lift or jack stands and let the exhaust system cool completely.
- Disconnect the exhaust at the catalytic converter exit flanges using appropriate tools.
- Remove the factory cat-back system from all OEM hanger points.
- Route the Corsa mid-pipe into position and connect to the catalytic converter outlets.
- Attach the muffler assembly and secure to OEM hanger locations.
- Center the polished Pro-Series tips evenly in the rear bumper exit cutouts.
- Tighten all clamps and connections to the specified torque.
- Start the engine and verify no exhaust leaks at any connection point.
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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