Black Market Race Rear Differential Solid Mount Brace | BMW G-Series & Toyota GR Supra

Black Market Race Rear Differential Solid Mount Brace

BMW G-Series | BMW Z4 | Toyota GR Supra A90/A91

Reduce unwanted differential movement and improve drivetrain stability with the Black Market Race Rear Differential Solid Mount Brace.

This supplemental brace connects the rear differential cover directly to the vehicle’s subframe, helping reduce flex under acceleration without replacing the factory differential mounts. The added reinforcement can improve traction, throttle response, drivetrain stability, and wheel-hop control during hard launches and spirited driving.

Unlike mounting systems that rely on rivet nuts, this kit uses a tapped steel backing plate installed inside the subframe. This design provides a more secure mounting point and distributes drivetrain loads across a larger area.

Features

• Adds an additional solid rear differential mounting point
• Helps reduce differential movement under load
• Improves drivetrain stability and throttle response
• Helps reduce wheel hop during hard acceleration
• Retains the original factory differential mounts
• Tapped steel backing plate for secure mounting
• Does not rely on rivet nuts
• Stainless-steel mounting hardware
• Precision drill bit included
• Bolt-on design with one required subframe hole
• Designed for street and performance-driven vehicles

What’s Included

• Rear differential solid mount brace
• Tapped steel backing plate
• Stainless-steel installation hardware
• Precision drill bit

Vehicle Fitment

BMW 2-Series

• BMW 230i (G42): 2022–Present
• BMW M240i xDrive (G42): 2022–Present

BMW 3-Series

• BMW M340i / M340i xDrive (G20): 2019–Present
• BMW M340i / M340i xDrive LCI (G20N): 2023–Present
• BMW M340i Touring (G21): 2019–Present
• BMW M340i Touring LCI (G21N): 2023–Present
• BMW M340Li (G28)
• BMW M340Li LCI (G28N)

BMW 4-Series

• BMW M440i / M440i xDrive Coupe (G22): 2021–Present
• BMW M440i Coupe LCI (G22N): 2024–Present
• BMW M440i Convertible (G23): 2021–Present
• BMW M440i Convertible LCI (G23N): 2024–Present
• BMW M440i Gran Coupe (G26): 2022–Present

BMW Z4

• BMW Z4 sDrive30i (G29): 2019–Present
• BMW Z4 M40i (G29): 2019–Present

Toyota

• Toyota GR Supra A90
• Toyota GR Supra A91

Confirm your exact model, drivetrain, differential cover, and subframe configuration before ordering.

Important Installation Notes

• Installation requires drilling one hole into the rear subframe
• The factory differential mounts remain installed
• The included steel backing plate must be positioned inside the subframe
• Proper drilling location and secure hardware torque are critical

Availability

Current estimated lead time: 3–4 business days before shipment.

Installation

Professional installation is strongly recommended because drilling into the vehicle’s subframe is required. Incorrect positioning or installation may affect fitment and drivetrain alignment.

Uproar Customs does not provide installation guides or technical support for self-installation.