Powerflex PFR5-1921 Rear Subframe/Cradle Bush Inserts (Pair) for BMW 3 Series F30 F31 F34 F3x Saloon Touring GT – Polyurethane Rear Axle Subframe Bushing Void Filler Handling Upgrade – Fits OE 33316792510

Rear Subframe Rear Bush Insert Kit for BMW 3‑Series F30 F31 F34 — Powerflex PFR5-1921

Tighten up the back end of your BMW and unlock confident, precise handling with this Powerflex rear cradle bush insert kit, part number PFR5-1921. This pair of polyurethane inserts presses into the voids of the original rear sub-frame mount to curb unwanted movement and keep your suspension geometry consistent. A simple, high-impact upgrade for fast-road and track use that maintains everyday comfort.

Why enthusiasts choose this upgrade

• Controls rear cradle shift for a planted, predictable feel
• Sharper turn-in and steadier braking on bumpy roads
• Improved traction and reduced squirm under hard acceleration
• No need to replace the whole OE rubber mount
• Long-lasting polyurethane with excellent NVH control
• Backed by a lifetime warranty for peace of mind

How it works

The PFR5-1921 inserts locate within the cavities of the factory rear sub-frame bush. By limiting flex, the rear axle stays aligned with the chassis so tyres track true, grip is more consistent and the car feels more stable at speed. You get the precision you want without the harshness of solid mounts.

Fitment and key details

Compatible models: BMW 3‑Series F30 Saloon, F31 Touring, F34 Gran Turismo.

Powerflex part number: PFR5-1921

OE reference it fits: 33316792510

Diagram reference: 21

Contents: 2 inserts per pack

Proven on our builds

We have fitted these rear cradle inserts on our own cars and for customers, and the feedback is consistent. Tighter rear-end control, more confidence on B‑roads, and a calmer feel on motorway journeys. A small change that makes the whole car feel more cohesive.

Professional installation

Want it fitted properly first time. Book in with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk and our team will advise on installation and complementary suspension tuning for your setup.

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Choose Powerflex PFR5-1921 to reduce rear sub-frame movement, protect your tyres, and transform steering precision with a quick, effective upgrade that lasts.