Powerflex Black Series Adjustable Caster Alignment Front Radius Arm/Lower Control Arm Rear Poly Bush/Bushing Kit for BMW 4 Series F32 F33 F36 (F3x, 2013-2020) - Tension Strut/Wishbone Lollipop Bush Upgrade, Track/Drift - PFF5-1901GBLK

PFF5-1901GBLK Adjustable Caster Poly Bush Kit for BMW 4 Series F32 F33 F36

Give your BMW 4 Series sharper steering, stronger front-end grip and rock-steady stability with this competition-grade polyurethane bush kit for the front tension strut to body location. Built from the Powerflex Black Series compound, this setup is designed for serious drivers who want maximum control on track days, sprint events, time attack and fast road use.

By replacing the soft factory elastomer mounts with an adjustable offset poly bush, you can dial in additional positive caster for cleaner turn-in, improved straight line stability and more confidence on corner entry. The high-durometer material keeps geometry locked in under braking and lateral load, helping tyres work harder and wear more evenly.

• Adjustable caster tension strut to body poly bushes for front axle alignment tuning
• Black Series 95A polyurethane resists deflection for consistent geometry and precise feedback
• Enhances steering feel, braking stability and initial turn-in on circuit and fast road
• Replaces the OE rubber mount to reduce unwanted movement and tighten chassis response
• Ideal upgrade for track day, drift, autocross and performance driving

Fitment and position

BMW 4 Series F32 F33 F36. Front lower control arm rear bush location, often called the tension strut or radius rod to chassis mount.

Technical details

• Part number: PFF5-1901GBLK
• Series: Black Series for competition-focused setups
• Material hardness: 95 Shore A polyurethane
• Diagram reference: 2
• Pack quantity: 2 bushes
• Replaces BMW OE part numbers: 31126852991 and 31126852992

Real-world results

We run this kit on our own builds and our customers consistently report crisper steering, better mid-corner stability and greater confidence under hard braking. If you want a genuine handling upgrade for the F32 F33 F36 platform, this is a proven, track-ready solution that still performs brilliantly on the road.

Why choose this upgrade

• Front wishbone rear bush upgrade that tightens the front end without excessive NVH
• Allows alignment correction to optimise caster and maximise tyre contact patch
• Durable, long-lasting poly bush kit designed for repeated high-load use
• Direct replacement design for straightforward installation

Professional fitting

For installation, we recommend MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

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