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Thermal R&D B911-C911 3" Catback Exhaust — 2021+ Ford Bronco 4-Door
The Thermal R&D B911-C911 is a 3" catback exhaust system designed specifically for the 2021+ Ford Bronco 4-Door. Built in Lancaster, California from T304 mandrel-bent stainless steel, the B911-C911 delivers a bold, aggressive exhaust note befitting the Bronco's character while Thermal R&D's patented Helmholtz resonator technology eliminates cabin drone at highway speeds. The system is designed with high-clearance routing to preserve the Bronco's factory ground clearance and off-road capability.
The B911-C911 is a direct bolt-on to the factory exhaust connection with no cutting, welding, or drilling required. Optional tip finishes are available depending on selected configuration.
Key Features
- 3" T304 mandrel-bent stainless steel construction
- Patented Helmholtz resonator for drone-free performance
- High-clearance routing preserves factory Bronco ground clearance
- Fits 2021+ Ford Bronco 4-Door 2.7L EcoBoost
- Direct bolt-on — no cutting or welding required
- Made in Lancaster, California, USA
What's Included
- Thermal R&D B911-C911 catback exhaust assembly
- Exhaust tip(s) per configuration
- OEM-style mounting hardware and hangers
- Installation instructions
Specifications
| Specification | Detail |
|---|---|
| MPN / Part Number | B911-C911 |
| UPC | Registered with Thermal R&D |
| Material | T304 Stainless Steel |
| Pipe Diameter | 3" |
| Fitment | 2021-2025 Ford Bronco 4-Door 2.7L EcoBoost |
| Routing | High-clearance, off-road compatible |
| Installation | Direct bolt-on |
| Country of Origin | Made in Lancaster, CA USA |
| Warranty | Limited Lifetime to original vehicle owner |
Frequently Asked Questions
-
What years and configuration does the B911-C911 fit?
The B911-C911 fits 2021 through 2025 Ford Bronco 4-Door models. The 4-Door Bronco is specifically required as the 2-Door Bronco has a different exhaust routing. -
Does the B911-C911 fit the 2-Door Bronco?
No. The B911-C911 is designed for the 4-Door Bronco only. The 2-Door Bronco uses a different system. -
Will the B911-C911 reduce ground clearance on my Bronco?
No. The B911-C911 is routed with high clearance specifically to preserve the factory ground clearance for off-road use. -
Will this drone on the highway?
No. Thermal R&D's Helmholtz resonator is tuned to the Bronco 2.7L EcoBoost to eliminate drone frequencies at cruising speeds. -
Is the B911-C911 a bolt-on installation?
Yes. It connects directly to the factory exhaust connection with no cutting, welding, or drilling required. -
Does the B911-C911 affect towing capability?
The B911-C911 is an exhaust-only modification and does not affect the Bronco's rated towing capacity. -
Where is it manufactured?
Lancaster, California, USA by Thermal R&D. -
What warranty is provided?
Limited Lifetime warranty to the original vehicle owner, non-transferable, excluding commercial and racing use.
Installation Instructions
Safely lift and support the Bronco. Remove the factory catback from the exhaust connection rearward. Route the B911-C911 using the supplied OEM-style hangers paying attention to the high-clearance routing shown in the instructions, connect the inlet flange, torque all hardware to specification, and align the tips. Install time approximately 60 to 90 minutes. Full written instructions included.
Prop 65 Warning
WARNING: This product can expose you to chemicals including chromium and nickel compounds from combustion exhaust, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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