Powerflex Rear Subframe Front Bush Inserts (Pair) for BMW 1 Series F20 F21 | Road Series Poly Bushes | PFR5-1920 | Replaces OEM 33316792509

Powerflex PFR5-1920 Rear Axle Cradle Insert Kit for BMW 1 Series F20 F21

Want your 1 Series to feel tighter, more planted and more predictable on British roads? This PFR5-1920 insert kit targets the soft voids in the factory rear axle carrier mounts to control movement under load. The result is crisper turn-in, improved traction out of bends and a more connected drive without sacrificing everyday comfort. A simple, high-impact upgrade for fast road use and spirited driving.

Key benefits

• Locks down the rear cradle to keep alignment more consistent during acceleration, cornering and braking
• Sharper chassis response with reduced rear-end squirm and less unwanted flex
• More confidence on uneven surfaces with better stability over bumps
• Helps promote even tyre wear by keeping geometry in check
• Road Series polyurethane compound balances performance with refinement for daily use
• Great value handling upgrade that works alongside springs, dampers and wider tyres

How it works

These precision-moulded polyurethane inserts fit into the cavities of the original rear cradle front mounts, reinforcing the OE rubber without deleting it. By filling those gaps, sub-frame shift is reduced, keeping the rear axle located and the suspension working as intended. Expect a more direct feel with minimal added NVH.

Fitment and details

• Vehicle: BMW 1 Series F20 and F21
• Position: Rear axle carrier front mounts
• Quantity: Pair
• Series: Road Series
• Powerflex reference: PFR5-1920
• Replaces OE reference: 33316792509
• Diagram reference: 20

Tried and trusted by MJ Modifications

We have installed this kit on our own builds and many customer cars at MJ Modifications, and feedback is consistently positive. Drivers report a more planted rear end, cleaner feedback through the chassis and greater confidence on B-roads. It is a small change that delivers a big difference.

Professional installation

Prefer expert fitting? Book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Why buy from us

• Performance parts specialists with hands-on experience of this exact upgrade
• Honest advice to help you get the handling balance you want
• Fast UK dispatch and support from enthusiasts who fit what we sell

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