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A Trail Ready Tone That Still Behaves On The Highway
The B911-C911-C is a catback exhaust system built for the 2021 to 2025 Ford Bronco 4 door with the 2.7L EcoBoost V6. Constructed from mandrel bent T304 stainless steel, the B911-C911-C replaces the factory catback section while keeping the vehicle's factory ground clearance intact, so it stays out of the way on the trail and off road. Thermal R&D finishes this system with a ceramic coated rear muffler for extra heat resistance and applies its True Helmholtz Technology muffler tuning to keep cruising drone in check while still delivering an aggressive tone on acceleration. The B911-C911-C bolts to the factory hangers and connects at the OEM downpipes, so no cutting or welding is needed for installation.
Key Features
- Mandrel bent T304 stainless steel catback construction
- Ceramic coated rear muffler for improved heat resistance and a clean look
- True Helmholtz Technology muffler tuning controls drone while cruising
- Hugs the factory frame line to preserve ground clearance for off road use
- Bolt on install using OEM hangers and downpipe connections, no cutting or welding
- Backed by Thermal R&D's lifetime manufacturer warranty
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2021-2025 | Ford | Bronco | 4Dr |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | B911-C911-C |
| Brand | Thermal R&D (Thermal Research and Development) |
| System Type | Catback exhaust |
| Pipe Diameter | 3 inch mandrel bent tubing |
| Material | T304 stainless steel |
| Muffler Finish | Ceramic coated rear muffler |
| Drone Elimination | True Helmholtz resonator technology |
| Mounting | OEM downpipe connection, OEM hangers |
| Installation | Bolt on, no cutting or welding required |
| Country of Manufacture | USA (Lancaster, California) |
What's Included
- B911-C911-C catback exhaust assembly with ceramic coated muffler
- All hardware and clamps needed for a complete install
- Installation instructions
About Thermal R&D
Thermal R&D designs and builds its exhaust systems in Lancaster, California, focusing on flow gains and a controlled exhaust note rather than raw volume. The company's True Helmholtz Technology muffler tuning is used across its catback and frontpipe back lineups to reduce cabin drone at cruising speed while preserving an aggressive tone under acceleration. Every Thermal R&D exhaust system, including the B911-C911-C, carries a lifetime manufacturer warranty and is built from mandrel bent T304 stainless steel for long term corrosion resistance.
FAQ
What is the B911-C911-C?The B911-C911-C is Thermal R&D's catback exhaust system for the 2021-2025 Ford Bronco 4 door with the 2.7L EcoBoost V6, featuring a ceramic coated rear muffler and mandrel bent T304 stainless steel construction.
Will the B911-C911-C reduce my Bronco's ground clearance off road?No, the B911-C911-C is designed to hug the factory frame line, so it preserves the same ground clearance as the factory exhaust for trail and off road use.
Does installing the B911-C911-C require any cutting or welding?No. The B911-C911-C connects at the factory downpipes and uses the OEM hanger locations, so no cutting or welding is required.
Does the B911-C911-C fit the 2.3L four cylinder Bronco?The B911-C911-C is built specifically for the 2.7L EcoBoost V6 Bronco 4 door, so owners of the 2.3L four cylinder should look for Thermal R&D's 2.3L specific system instead.
How much drone will I hear on the highway with the B911-C911-C installed?Thermal R&D tunes the B911-C911-C with True Helmholtz Technology specifically to cancel resonant drone frequencies, so most owners report a controlled cruising tone with more aggressive character showing up under throttle.
Can I install the B911-C911-C myself, or should I have a shop do it?Most owners install the B911-C911-C at home with basic hand tools and a jack and stands, since it bolts to the factory hangers without cutting.
Does the B911-C911-C come with a warranty?Yes, the B911-C911-C is backed by Thermal R&D's lifetime manufacturer warranty against defects in materials and workmanship.
What is the difference between the B911-C911-C and the raw finish version of this exhaust?Both systems share the same mandrel bent T304 stainless steel construction and Helmholtz muffler tuning. The B911-C911-C uses a ceramic coated rear muffler, while the raw version uses an uncoated mill finish muffler instead.
Install Instructions
- Allow the exhaust to cool fully, then raise the Bronco on a lift or jack stands with adequate clearance underneath.
- Remove the factory catback exhaust starting at the downpipe connection, releasing each factory hanger isolator as you work toward the rear.
- Test fit the B911-C911-C at the downpipe connection point, leaving all clamps loose for adjustment.
- Route the remaining sections through the factory hanger locations, keeping the ceramic coated muffler tucked along the factory frame line.
- Adjust the overall system position and exit alignment before tightening any connections fully.
- Tighten all clamps to the specified torque, start the vehicle, and check every joint for leaks before returning it to service.
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