Powerflex PFR5-1921 Rear Subframe/Cradle Bush Insert Kit (Pair) - BMW 4 Series F32 F33 F36 xDrive AWD (F3x) - Polybush Polyurethane Suspension Bushing Mount Upgrade - Rear Axle Carrier Mount Inserts - Lifetime Warranty - OE 33316792510

Poly Bush Insert Set PFR5-1921 for BMW F32 F33 F36 xDrive Rear Cradle

Dial in tighter chassis control on your BMW 4 Series xDrive with this Powerflex PFR5-1921 rear cradle insert pair. These precision polyurethane inserts fill the cavities in the factory rear carrier mounts to curb unwanted movement, giving cleaner steering feedback, stronger traction and more consistent geometry under load. Ideal for daily driving and fast road use, they deliver a noticeable gain in rear-end composure without the harshness of solid mounts.

• Part number: PFR5-1921
• Fitment: BMW 4 Series F32 Coupe, F33 Convertible, F36 Gran Coupe with xDrive all-wheel drive
• Location: Rear axle carrier rear position insert
• Diagram reference: 21
• Pack contents: Pair of inserts
• Material: Performance polyurethane
• Backed by the Powerflex Lifetime Warranty
• OE cross-reference for guidance: 33316792510

What this upgrade improves

• Reduces cradle deflection for crisper response and predictable handling behaviour
• Boosts grip and stability during hard acceleration and braking
• Helps maintain wheel alignment to minimise uneven tyre wear
• Enhances road holding and corner exit confidence with minimal change in NVH
• Great value enhancement compared with replacing complete OEM rubber mounts

Over time, soft rubber mountings allow the rear axle assembly to shift as torque loads build, which blurs feedback and can cause that vague rear feel. Powerflex polyurethane controls compliance far better, keeping the suspension working in its intended range so your tyres stay planted and your F3x xDrive feels more settled on B-roads and motorways alike.

Compatibility

Designed specifically for BMW 4 Series xDrive on the F-chassis:

• F32 4 Series Coupe xDrive
• F33 4 Series Convertible xDrive
• F36 4 Series Gran Coupe xDrive

This is an insert kit that fits into the voids of the original rear axle carrier rear mounts. Please check diagram 21 and part number PFR5-1921 before purchase to ensure suitability for your vehicle.

What is included

• 2 x Powerflex polyurethane rear carrier insert pieces
• Fitting guidance from Powerflex where applicable
• Warranty support for peace of mind

Installation and support

Professional fitting recommended. For hassle-free installation, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored quotation and workshop availability.

Proven in our workshop

We have installed these Powerflex inserts on customer F32, F33 and F36 xDrive cars and the feedback has been consistently positive. Owners report a more planted rear end, improved turn in, better mid-corner stability and greater confidence without sacrificing everyday comfort.

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