The Eventuri G8X M2, M3, and M4 Carbon Strut Brace has quickly established itself as one of the most thoughtfully engineered structural upgrades available for the S58 platform. Since its release, the brace has gained recognition for its exceptional build quality, purposeful design, and complete hardware solution.
Constructed from high-quality prepreg carbon fiber, the brace is engineered to enhance chassis rigidity while delivering a commanding visual presence within the engine bay. Eventuri approached this component with the same philosophy that defines their intake systems, blending advanced engineering with meticulous craftsmanship.
The surface geometry is intentionally complex, featuring raised sections and deep fillets that help distribute dynamic loads while contributing to an organic, motorsport-inspired aesthetic. Fluid transitions across the brace create a cohesive design language that complements the surrounding engine components.
CNC-machined inserts and custom-manufactured stainless steel hardware further reinforce the structural integrity of the assembly. The hardware itself is machined from natural-finish 316 stainless steel, providing both corrosion resistance and a refined contrast against the carbon fiber weave. Deeply sculpted mounting pockets are lined with satin anodized inserts, adding another layer of visual depth while maintaining precise fitment.
Beyond its structural function, the brace serves as a centerpiece within the engine bay, framing the intake and engine cover while elevating the overall presentation of the S58 platform.
Available Configurations
- EVE-S58-CF-STR: BMW G8X M2, M3, M4 Carbon Strut Brace – Gloss Finish
- EVE-S58-CFM-STR: BMW G8X M2, M3, M4 Carbon Strut Brace – Matte Finish
What’s Included
- Carbon Fiber Strut Brace
- Integrated Metal Inserts
- 1 × M10 Bolt with Solid Washer
- 4 × M8 Bolts with Solid Washers
- 8 × M8 Nuts with Solid Washers
Load Testing and Engineering Validation
Bilal, Eventuri’s Head Engineer, is known for prioritizing measurable performance alongside design. While many manufacturers have access to carbon production, true engineering validation is what ultimately separates a premium structural component from a purely cosmetic one.
To ensure the brace delivered real-world benefits, Eventuri commissioned independent laboratory testing to measure deflection characteristics against the OEM BMW CSL brace.
“Eventuri instructed an independent testing company to measure the deflection of our carbon brace and compare that against the OEM CSL brace. Both braces were mounted to a custom-made jig to which both tensile and compressive loads were applied. The maximum load applied was 10kN. As can be seen in the results, the carbon brace performed marginally better than the OEM CSL brace.”
Pull Load Testing Results
“These graphs show the load (y axis) vs deflection (x axis). With the load applied as a PULLING force to the top left corner as shown above, these 4 graphs show the deflection of the carbon brace (orange plot) and the OEM CSL brace (blue plot).
As can be seen, the carbon brace does not deflect as much as the OEM brace at the measurement points G1 to G4 as shown in the diagram above. G1 to G3 are the deflection measurement points in a horizontal plane. The point G4 is the deflection in a vertical plane at the location of G1.
Summary of results at maximum load:
Point G1 at 4.8kN: Eventuri = 58 microns : OEM = 121 microns
Point G2 at 6kN: Eventuri = 85 microns : OEM = 291 microns
Point G3 at 10kN: Eventuri = 613 microns : OEM = 1291 microns
Point G4 at 10kN: Eventuri = 2503 microns : OEM = 3702 microns”
Push Load Testing Results
“These graphs show the load (y axis) vs deflection (x axis). With the load applied as a PUSHING force to the top left corner as shown above, these 4 graphs show the deflection of the carbon brace (orange plot) and the OEM CSL brace (blue plot).
Summary of results at maximum load:
Point G1 at 10kN: Eventuri = 83 microns : OEM = 181 microns
Point G2 at 10kN: Eventuri = 1007 microns : OEM = 1051 microns
Point G3 at 6kN: Eventuri = 396 microns : OEM = 300 microns
Point G4 at 10kN: Eventuri = 4210 microns : OEM = 6922 microns”
Laboratory Testing Methodology
“Two car engine brace samples were received in the laboratory on 10 October 2025 :
The samples were given our laboratory reference numbers E684 & E685. The samples were described as follows:
Sample E684: Aluminium engine brace measuring approximately 1200mm maximum length and 530mm width. The thickness was in the range 16-30mm.
Sample E685: Carbon Fibre engine brace approximately 1200mm total length and 510mm width. The thickness was in the range of 25-35mm.
The samples included several fixings points located in 3 areas. These were on the left and right ends (ends A & B) which included 2 fixing holes at each end while the front side (Side B) included 3 fixing holes.”
“A test rig was manufactured to accommodate the test samples, such that they were fixed in a horizontal plane to a steel plate which was attached to a rigid test bed. The fixing holes were used to bolt the samples to the steel plate.”
“The testing was affected by fixing two points while applying a lateral load to the third point. At each point, the load was applied in two directions, a pull test away from the brace and a push test into the brace.
The deflection of the brace was measured at 4 locations.
For each test, the load was applied incrementally up to a load of 10kN. The deflection of the samples was measured at 4 points as shown above.”
Engineering That Sets a Benchmark
Independent testing with measurable data is what continues to separate Eventuri from much of the aftermarket. The ability to validate structural performance through controlled laboratory conditions reinforces confidence that the component is not only visually compelling but engineered with purpose.
For G8X owners seeking a structural upgrade that blends advanced materials, precision manufacturing, and verified performance characteristics, the Eventuri CSL Carbon Strut Brace represents a thoughtful evolution of chassis reinforcement for the modern M platform.
