BMR Rear Differential Solid Mount Brace BMW M240i, M340i, and Toyota Supra (G42, G2X, A9X, Z4)

The Black Market Race Rear Differential Solid Mount Kit

 is a supplemental brace that connects the rear differential cover directly to the subframe, significantly reducing flex and stabilizing the drivetrain under load. This added reinforcement improves traction, throttle response, and reduces wheel hop—without replacing the factory mounts.

Unlike other kits that rely on rivet nuts, ours uses a tapped steel back plate inserted into the subframe for a secure mount and significantly better load distribution.

At the end of the day we are confident that this is the most rigid and easy to install rear differential bracing solution on the market for the platform.

One new hole must be drilled into the subframe—a precision drill bit is included with the kit for convenience. All mounting hardware is stainless steel for long-term strength and corrosion resistance.

• Adds a solid rear mount to reduce differential movement under load
• Improves traction, throttle response, and drivetrain stability
• Tapped steel back plate—no rivet nuts or weak hardware
• Includes all stainless steel hardware and drill bit needed for install.
• Requires drilling one hole in the subframe
• Bolt-on installation with no removal of factory mounts

 FITMENT

• G42 – 2 Series (2022+)
  
  • BMW M240i xDrive
• G20 – 3 Series Sedan (2020+)
  • BMW M340i / M340i xDrive
• G22 – 4 Series (2021+)
  
  • M440i Convertible/Coupe
• G29 – Z4 Roadster (2019+)
  • BMW Z4 M40i
• A90 / A91 Supra

Orders are processed same or next business day. Shipping times vary depending on the product, shipping service, and whether freight shipping is required. While we ensure all inventory levels are current and accurate, they can change due to logistics and inventory feeds. Standard shipping typically takes 3-7 business days, but some items may require additional time depending on their origin. Feel free to call us anytime for the latest status of your order.