CARBON FIBER STRUT BRACE FOR BMW M5 G9X

Right + Left Kit with Integrated Airbox Support

Optimize the dynamic performance, structural rigidity, and engine bay aesthetics of your BMW M5 G9X with the Karbonius Composites carbon fiber strut brace, specifically developed for this model under strict advanced engineering and Motorsport technology criteria.

This complete kit, consisting of right and left components, directly replaces the OEM strut brace 51 61 8086047 / 48 and integrates the airbox support function, just like the original part—but with a radical weight reduction and a real improvement in front-end rigidity.

Extreme Lightness and Superior Rigidity: The OEM BMW M5 G9X strut brace, manufactured from AISI 10MnMg-F microalloyed steel, weighs approximately 745 g per unit. The Karbonius carbon fiber version reduces this to just 250 g per unit, achieving a weight reduction of up to 66%.

Key benefits:

• Reduced front-end mass
• Improved weight distribution
• Greater steering precision
• More direct chassis response

 

Advanced Carbon Fiber Engineering: Manufactured using a monoblock one-shot process, in a single operation with no joints or welds.

High-modulus unidirectional (UD) carbon fibers, oriented exclusively along real load paths

Multimaterial construction combining structural fabrics and UD layers

Internal stainless steel insert for maximum geometric accuracy, durability, and reliability at mounting points

The result is a true structural component—extremely rigid, lightweight, and designed to withstand loads exceeding those of the original OEM part.

 

Structural Validation by an Independent Laboratory: This strut brace has undergone:

FEA (Finite Element Analysis):Real load bench testing performed by AIMEN, an independent reference laboratory specializing in automotive and advanced materials

Test results confirm that the Karbonius strut brace exceeds the strength levels of the OEM component, proving that weight reduction directly improves the overall rigidity of the assembly.

 

Driving Benefits

• Increased rigidity between strut towers
• Reduced front-end flex under load
• More precise and stable steering
• Greater confidence in corners and at high speeds
• Improved airbox support and stability

 

Plug & Play Installation:Direct replacement using original mounting points

No modifications required

All necessary hardware included

 

Additional information (Technical Data)

Compatible vehicle: BMW M5 G9X

OEM reference replaced: 51 61 8086047 / 48

Material: Carbon fiber (high-modulus UD + multimaterial construction)

Manufacturing process: Monoblock one-shot

OEM weight:745 g per unit

Karbonius weight: 250 g per unit

Weight reduction: Up to 66%

Validation: Structural and load testing by independent laboratory (AIMEN)

Installation: Plug & Play

 

Included Hardware

• 2 × Countersunk bolts with washer, BMW Ref.: 51 71 6966566, Size: M10x45
• 4 × Hex bolts BMW Ref.: 07 11 9909793

 

Notice of installation: Although our products are designed for an OEM-like fit, some minor adjustment may be required. Check that the fitting of the part is as expected before making any painted or modifications to the parts or to the car . Karbonius Composites will not be responsible for the costs of revert the vehicle to its original condition, or any painting expenses.

WARRANTY

• 3-year warranty against manufacturing defects

WARNINGS:

• Is customers responsibility complying with the applicable laws in their community to use this product on public roads.
• These are not original products of BMW brand.
• Prices are shown in euros and do not include shipping costs, taxes or fees
• The weights specified on the description may vary by +/- 10%