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
  • 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 1 WEEK TO SHIP

Thank you for your patience!

The items installed or applied to vehicles are intended strictly for off-road use only and track vehicles. These modifications may not comply with emissions, safety, or environmental regulations required for public road use under Environmental Regulatory Agency (ERA) laws. It is the sole responsibility of the vehicle owner or operator to ensure adherence to all applicable local, state, and federal regulations. Use on public roads may result in legal penalties or vehicle impoundment. Always verify compliance with local authorities before installation.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

If you're unsure whether a part will fit your vehicle, feel free to contact us here with your inquiry. Our helpful sales team will reach out to confirm if it's the right match for you.

We offer a flat-rate shipping fee across the continental United States. This excludes Alaska, Hawaii, and U.S. territories. For international orders, additional shipping costs will apply. Please contact us for a quote if you are outside the continental U.S.

Also, feel free to also contact us at ColoradoN5X@Gmail.Com for any other questions.

Not all items are covered by warranty. Items including warranty, will clearly state that there is warranty within the product description. Most of these items will be a standard 1-year warranty against manufacture defects. You, the customer, will be responsible for shipping and handling. We will fix/replace that item with a product that is in working condition if you meet the warranty criteria. Please note that you will be allowed ONLY 1 claim within the year for that product. ColoradoN5X is not responsible for any damage caused during the installation of our products.