CARBON FIBER STRUT BRACE FOR BMW M5 G9X
Product description
Complete right + left kit with integrated airbox bracket, direct OEM replacement for 51 61 8086047 / 48.
Optimize the dynamic behavior, structural rigidity, and engine bay aesthetics of your BMW M5 G9X with the Karbonius Composites carbon fiber strut tower brace, developed specifically for this model under strict advanced engineering criteria and Motorsport technology.
This complete kit, consisting of right and left pieces, directly replaces the original OEM brace 51 61 8086047 / 48 and integrates the airbox bracket function, just like the original component, but with a radical weight reduction and a real improvement in front-end rigidity.
Benefits of CARBON FIBER STRUT BRACE FOR BMW M5 G9X
Extreme lightness and superior rigidity: The OEM BMW M5 G9X brace, manufactured in AISI 10MnMg-F micro-alloyed steel, weighs approximately 745 g per unit. The Karbonius version reduces the weight to just 250 g per unit, achieving a reduction of up to 66%.
- Lower front-end mass
- Improved weight distribution
- Greater steering precision
- More direct chassis response
Advanced carbon fiber engineering: Manufactured using a monoblock oneshot process, in a single operation without joints or welds.
High-modulus unidirectional (UD) carbon fibers, oriented exclusively according to actual load directions
Multi-material construction with structural fabrics and UD laminates
Internal stainless steel insert for maximum geometric precision, durability, and reliability at anchor points
The result is a true structural component, extremely rigid, lightweight, and designed to withstand loads exceeding those of the original part.
Structural validation in independent laboratory: This strut tower brace has been subjected to:
FEA (Finite Element Analysis): Real load testing on bench performed by AIMEN, an independent reference laboratory in automotive and advanced materials
Testing confirms that the Karbonius brace exceeds the strength levels of the OEM component, demonstrating that weight reduction improves the overall rigidity of the assembly.
Driving benefits
- Greater rigidity between strut towers
- Less front-end flex under load
- More precise and stable steering
- Greater confidence in corners and at high speed
- Better airbox support and stability
Technical information and specifications
Compatible vehicle: BMW M5 G9X
OEM reference replaced: 51 61 8086047 / 48
Material: Carbon fiber (high-modulus UD + multi-material construction)
Manufacturing process: Monoblock oneshot
OEM weight: 745 g per unit
Karbonius weight: 250 g per unit
Weight reduction: Up to 66%
Validation: Structural and load testing in independent laboratory (AIMEN)
Installation: Plug & Play
Hardware included:
- 2 × Countersunk screws with washer: BMW Ref.: 51 71 6966566, Size: M10x45
- 4 × Hexagonal screws, BMW Ref.: 07 11 9909793
How to install the product
Plug & Play installation: Direct replacement on original mounting points
No modifications required
Includes all necessary hardware
📌 Installation Notes
- Professional installation recommended
- Minor adjustments may be necessary for optimal fitment
- Designed for OEM-style fit, although slight modifications may be required
Warnings
⚠️ Important Information
- It is the customer’s responsibility to verify legality according to local regulations
- This product is not OEM BMW
- Price does not include shipping, taxes, or additional fees
- Stated weight may vary ±10%
Documentation
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