Drivetrain› Differentials and Rear-End Components

Black Market Race

Differential Mount Insert

$299.99

SKU: BMR-BMW-REAR-BRACE

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

It significantly reduces flex and stabilizes the drivetrain under load. This reinforcement improves traction, throttle response, and reduces wheel hop without replacing factory mounts. The kit uses a tapped steel back plate inserted into the subframe for a secure mount.
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This significantly reduces drivetrain flex and stabilizes the differential under load. By adding this reinforcement, you can expect improved traction, enhanced throttle response, and a reduction in wheel hop, all without needing to replace your factory mounts. This kit features a unique tapped steel back plate that is inserted into the subframe, providing a much more secure and robust mounting point compared to kits that rely on rivet nuts. This design ensures significantly better load distribution and overall rigidity. The brace is constructed from billet material for durability and longevity. However, it does require drilling one new hole into the subframe; a precision drill bit is included for convenience. All mounting hardware is made from stainless steel to ensure long-term strength and resistance to corrosion. The brace is compatible with a wide range of vehicles, including the BMW 230i, M240i, M240i xDrive (G42), 330i, 330i xDrive, M340i, M340i xDrive (G20/G21), 430i, 430i xDrive, M440i, M440i xDrive (G22/G23/G26), Z4 sDrive40i, Z4 M40i (G29), and the Toyota GR Supra (A90/A91). It is specifically designed for models equipped with the 3.0L B58B30 engine.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandBlack Market Race
Part NumberBMR-BMW-REAR-BRACE
CategoryDrivetrain

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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