Powerflex PFR5-4030 Twin-Bush Dual Mount Rear Differential & Final Drive Support Brace/Bracket for BMW M2 M3 M4 F80 F82 F83 F87 F8X - Subframe Differential Mount Upgrade (OEM 33172284775)

Powerflex PFR5-4030 Twin-Bush Final Drive Support for BMW F80 F82 F83 F87

Unlock sharper traction and rear-end confidence on your F8x with the Powerflex PFR5-4030 twin-mount final drive support. This precision CNC-machined 6082 high tensile aluminium brace makes use of the unused second fixing point on the factory rear carrier, stabilising the final drive under load for cleaner launches, reduced axle tramp and crisper throttle pick-up. Perfect for fast road, track days and tuned builds looking for dependable drivetrain control.

Key reasons enthusiasts choose this rear-end upgrade

• Dual fixing design limits differential rotation under torque for consistent power delivery
• Noticeably tighter, more predictable rear axle behaviour on and off throttle
• Improves traction - helps cut wheel hop and axle tramp when accelerating hard
• Reduces stress on existing bushes, aiding longevity of surrounding mounts
• Satin black anodised finish for corrosion resistance and durability
• Engineered to cope with high torque applications and spirited driving

How it works

The F8x rear subframe is cast with provision for two rear final drive bushes, yet the factory installs only one. That single, offset bush becomes a pivot point that lets the unit twist when you apply torque, made worse as front bushes age. The PFR5-4030 adds the second attachment point, effectively bracing the assembly and keeping the final drive planted so your tyres put power down more effectively.

Proven on our cars and our customers’ builds

We have fitted this Powerflex support on our own F8x projects and many customer vehicles. Feedback is consistently positive - tighter rear-end control, calmer launches and more confidence driving out of bends. It is a high-impact, low-compromise modification that complements anything from a stock car to a tuned track setup.

Pair it with complementary mounts for the ultimate solution

• PFR5-4026 - rear mounting bushes for both rear subframe positions
• PFR5-4025 - front mounting bushes for the final drive

Combine these with PFR5-4030 to minimise movement across every fixing point.

What you receive

• 1 x Powerflex twin-mount final drive support bracket
• M14 bolt
• Thread locker
• Powerflex keyring

Vehicle fitment

• BMW F87 M2 2014-2019
• BMW F80 M3 2012-2018
• BMW F82 M4 2013-2019
• BMW F83 M4 Convertible 2013-2019

Part numbers

• Powerflex part number: PFR5-4030
• OEM reference: 33172284775

Installation

Can be installed without fully removing the rear axle carrier. Professional fitting strongly recommended.

Want us to fit it for you? MJ Modifications offers expert installation in Warwickshire - request a quote at info@mjmodifications.co.uk.

Download the installation guide

Fitment check

We will verify compatibility before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout and we will confirm suitability.

Why buy from MJ Modifications

BMW performance specialists with hands-on experience and proven results. Genuine Powerflex components, trusted advice and upgrades that deliver on the road, on circuit and at the strip.

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