Powerflex
Powerflex Black Series PFF5-5401GBLK Front Lower Control/Radius Arm Rear Bushes, Caster Adjustable Polyurethane (Tension/Thrust Strut) for BMW Z4 G29 2018+ & Toyota GR Supra A90 J29 Mk5 2019+
Powerflex Black Series PFF5-5401GBLK Front Lower Control/Radius Arm Rear Bushes, Caster Adjustable Polyurethane (Tension/Thrust Strut) for BMW Z4 G29 2018+ & Toyota GR Supra A90 J29 Mk5 2019+
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Caster-adjustable front arm rear bush kit for BMW Z4 G29 and Toyota GR Supra A90 J29
Transform steering precision and front-end stability with this motorsport-grade polyurethane upgrade. Engineered by Powerflex for serious performance use, part number PFF5-5401GBLK replaces the soft factory rubber on the front lower arm rear mounting point, delivering crisp response, confidence under hard braking and geometry consistency mile after mile.
Why enthusiasts choose PFF5-5401GBLK
- 95A Black Series polyurethane with outer shells for exceptional rigidity and control
- Approximately 300% stiffer than OE rubber for tighter front axle compliance
- Built-in caster adjustment of around +/- 0.75 degrees for pull correction and alignment tuning
- Significantly limits fore and aft wheel movement during braking and corner entry
- Sharper on-centre feel, quicker turn-in and enhanced stability under load
- Oil and weather resistant for long-term durability and more even tyre wear
- Ideal for fast road, track day and performance-focused setups
We have installed these bushes on our own builds and customer cars, with feedback highlighting more direct steering, improved braking stability and repeatable handling on circuit and on B-roads.
What you receive
- 2 x bushes with outer shells
Quantity required per vehicle: 2. One kit covers the front axle.
Vehicle applications
- BMW Z4 G29 2018 onwards
- Toyota GR Supra A90 J29 2019 onwards
OEM cross-reference
- BMW: 31106878587, 31106878588
- Toyota: 48640-WAA02, 48620-WAA02
Fitting and alignment
- Professional installation recommended
- Torque all fasteners at normal ride height
- Full geometry check advised after installation to make the most of the caster adjustment
Want it fitted for you. Book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
Fitment check before dispatch
We will confirm compatibility before shipping. Provide your UK registration or the last 7 of your VIN at checkout so we can verify the correct part.
Genuine Powerflex Black Series
PFF5-5401GBLK is an authentic Black Series component created for maximum chassis control. The higher shore hardness material reduces unwanted compliance, helping you extract the most from quality tyres, dampers and alignment settings.
Search terms to help you find the right part
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