Powerflex Poly Bushes Pack – Rear Subframe Rear Bush Insert – PFR5-1921 – BMW 4 Series F32, F33, F36 xDrive
Transform the way your BMW 4 Series xDrive drives with the Powerflex Rear Subframe Rear Bush Insert kit, part number PFR5-1921. This high-performance polyurethane bush insert fits into the voids of the original rear subframe bush to reduce excessive subframe movement, improving handling precision, stability, and tyre contact. A proven suspension upgrade for fast road and daily use, this Powerflex bush insert sharpens the rear end without the harshness of solid mounts, giving you confident cornering and consistent braking stability.
- Part number: PFR5-1921
- Fitment: BMW 4 Series xDrive F32, F33, F36
- Location: Rear subframe rear bush insert
- Diagram reference: 21
- Pack contents: 2 inserts
- Material: Performance polyurethane
- Powerflex Lifetime Warranty
Why choose Powerflex rear subframe bush inserts
- Reduces subframe movement for sharper, more predictable handling
- Improves braking stability and traction under acceleration
- Helps reduce uneven tyre wear by keeping alignment more consistent
- Excellent balance of performance and comfort for road use
- Cost-effective upgrade compared with replacing full OE bushes
Imprecise handling, rear-end float, braking instability and uneven tyre wear are common symptoms of ageing rubber bushes. Powerflex polyurethane controls unwanted flex far better than soft OE rubber, keeping the suspension geometry stable so your tyres maintain maximum contact with the road. Correctly formulated polyurethane can match or exceed rubber for noise, vibration and harshness control while delivering a clear performance gain.
Fitment and compatibility
Designed for BMW 4 Series xDrive models 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 subframe rear bush to reduce movement. Please check diagram reference 21 and part number PFR5-1921 to confirm suitability for your car before ordering.
OE reference provided for cross-reference only: 33316792510.
What you get
- 2 x Powerflex polyurethane rear subframe rear bush inserts
- Fitting guidance from Powerflex where applicable
- Powerflex Lifetime Warranty support
Fitting and support
Professional fitting is recommended. Nforcd offers in-house installation at our Warwickshire workshop. Request a fitting quote at Sales@nforcd.com.
Tried and trusted by Nforcd customers
We have fitted these Powerflex rear subframe inserts on customer 4 Series xDrive cars and the feedback is consistently positive. Drivers report a tighter, more planted rear end, improved turn-in, and a noticeable boost in confidence without compromising day-to-day comfort.
Keywords and search terms
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