BMR Rear Differential Solid Mount Brace - BMW M240i, M340i, M440i and Toyota Supra

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
  • BMW 230i
• G20 – 3 Series Sedan (2019+)
  • BMW M340i / M340i xDrive
• G20N – 3 Series Sedan LCI (2023+)
  • BMW M340i / M340i xDrive (Facelift)
• G21 – 3 Series Touring (2019+)
  
  •  M340i Touring (Europe and select markets)
• G21N – 3 Series Touring LCI (2023+)
• M340i Touring (Facelift)
• G28 – 3 Series Long Wheelbase (China only)
  
  •  M340Li
• G28N – 3 Series LCI Long Wheelbase (China only) M340Li (Facelift)
• G22 – 4 Series Coupe (2021+)
  • BMW M440i / M440i xDrive
• G22N – 4 Series Coupe LCI (2024+)
  
  • M440i (Facelift)
• G23 – 4 Series Convertible (2021+)
  • BMW M440i Convertible
• G23N – 4 Series Convertible LCI (2024+)
  
  • M440i Convertible (Facelift)
• G26 – 4 Series Gran Coupe (2022+)
  • BMW M440i Gran Coupe
• G29 – Z4 Roadster (2019+)
  • BMW Z4 sDrive30i
  • BMW Z4 M40i
• A90 / A91 Supra

CURRENT LEAD TIME IS 3-4 DAYS TO SHIP

Thank you for your patience!