The latest addition to the MMX Performance lineup has officially arrived. Designed to solve one of the most common challenges encountered when installing larger aftermarket exhaust systems, the new MMX Underbody Chassis Brace delivers additional exhaust clearance while simultaneously increasing chassis rigidity.
Available for the BMW F8X M2, M3 and M4, the G87 M2, and the G8X M3 and M4, each brace is engineered as a direct replacement for the factory underbody support with no cutting, drilling, or permanent modifications required.
Clearance Without Compromise
Many aftermarket exhaust systems use larger diameter tubing than the original BMW exhaust. While this improves exhaust flow and sound, it can also reduce clearance around the factory underbody brace.
The MMX Underbody Chassis Brace addresses this issue by providing an additional 15mm of exhaust clearance while maintaining the vehicle's original ground clearance. Rather than lowering the brace beneath the vehicle, MMX re-engineered the design using precision-machined billet aluminum to maximize available space where it matters most.
For vehicles fitted with larger-diameter performance exhaust systems, this additional clearance helps reduce unwanted contact while preserving factory-like fitment.
More Than Exhaust Clearance
Although increased exhaust clearance was the primary design objective, the MMX brace also delivers structural benefits. Machined from billet 6061-T6 aluminum, the brace reinforces a key section of the vehicle's chassis while remaining lightweight thanks to its optimized profile.
The result is a component that helps improve chassis rigidity and overall vehicle responsiveness without sacrificing strength or adding unnecessary weight. Whether used on the street or track, the brace provides both functional and structural improvements.
Precision Engineered From Billet Aluminum
Every MMX Underbody Chassis Brace begins as a solid block of billet 6061-T6 aluminum before being precision CNC machined into its final form. The optimized design removes unnecessary material while preserving rigidity in critical load-bearing areas.
Installation is straightforward, using the factory mounting locations with no cutting, drilling, or permanent modifications required. The upgrade is also fully reversible if the vehicle ever needs to be returned to stock.
Key Features
- Provides an additional 15mm of exhaust clearance over the factory brace
- Maintains original vehicle ground clearance
- Increases chassis rigidity for improved dynamic performance
- Precision CNC machined from billet 6061-T6 aluminum
- Optimized lightweight profile without sacrificing strength
- Ideal for larger-diameter aftermarket exhaust systems
- Direct replacement for the OEM underbody brace
- Uses factory mounting locations
- No cutting, drilling, or permanent modifications required
- Fully reversible installation
Available Applications
BMW G87 M2
The G87 version was engineered specifically for the latest generation M2 platform, providing additional clearance for aftermarket exhaust systems while improving structural rigidity.
Product: MMX Performance BMW G87 M2 Underbody Chassis Brace
Vehicle Collection: BMW G87 M2
BMW G8X M3 / M4
Developed for the G80 M3, G81 M3 Touring, G82 M4 Coupe, and G83 M4 Convertible, this version provides an ideal solution for owners upgrading to larger aftermarket exhaust systems while adding chassis stiffness.
Product: MMX Performance BMW G8X M3 / M4 Underbody Chassis Brace
Vehicle Collections:
BMW F8X M2 / M3 / M4
Owners of the F87 M2, F87 M2 Competition, F80 M3, and F82/F83 M4 can also benefit from the same billet aluminum construction, increased exhaust clearance, and direct bolt-on installation.
Product: MMX Performance BMW F8X M2 / M3 / M4 Underbody Chassis Brace
Vehicle Collections:
Now Available from IND
The new MMX Performance Underbody Chassis Braces are now available through IND Distribution for the complete F8X and G8X BMW M lineup. Designed to provide additional exhaust clearance without sacrificing ground clearance while increasing chassis rigidity, each brace reflects MMX's focus on precision engineering, premium materials, and OEM-quality fitment.
Whether you're installing a larger aftermarket exhaust system or simply looking to strengthen the chassis with a lightweight billet component, the MMX Underbody Chassis Brace delivers a simple, functional upgrade backed by thoughtful engineering.
