Powerflex PFR5-1921 Poly Rear Subframe/Cradle Mount Insert Bush Kit (Pair) for BMW 4 Series F32 F33 F36 F3x - Road Series - Rear Axle Carrier Bushing Upgrade - Fits OE 33316792510

BMW F32 F33 F36 Rear Axle Subframe Mount Insert Kit by Powerflex – Road Series – PFR5-1921

Transform the rear-end feel of your BMW 4 Series with this polyurethane rear axle carrier insert kit. Powerflex PFR5-1921 is a pair of precision-moulded inserts that fit into the voids of the factory rear subframe mounts, limiting unwanted movement and keeping the rear geometry consistent under load. Expect a tighter, more planted chassis, cleaner power delivery out of corners and greater confidence on fast B-roads. If you are searching for BMW 4 Series rear cradle mount inserts, rear axle carrier bush upgrade or poly subframe insert kit, this is the one to choose.

Highlights

• Controls subframe shift for a more direct rear end and sharper turn-in.
• Improves traction and stability by reducing cradle deflection under acceleration and braking.
• Keeps alignment more consistent for predictable handling on spirited road driving.
• Fits into the existing OE mounts, retaining comfort while increasing precision.
• Great value upgrade without the complexity of full bush replacement.

What you get

• Part number: PFR5-1921
• Series: Road Series polyurethane insert kit
• Quantity: Pair of inserts (2 pieces)
• Diagram reference: 21
• Cross-reference: fits OE mount 33316792510

Compatibility

• BMW 4 Series F32 coupe
• BMW 4 Series F33 convertible
• BMW 4 Series F36 Gran Coupe
• F3x platform rear axle subframe rear position

Why enthusiasts choose this kit

We run these inserts on our own cars and customer builds. Feedback is consistently positive, with owners reporting a tighter rear axle, better confidence in quick direction changes and a more connected drive without sacrificing day-to-day usability. It is a simple, proven chassis upgrade that delivers immediate results.

Fitting

Professional installation recommended. For expert fitting and setup, contact MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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