Powerflex Poly Bushes Pack – Rear Subframe Rear Mounting Insert – PFR5-421 – BMW 3 Series E90, E91, E92, E93 (2005–2013)
Upgrade your BMW 3 Series suspension with the Powerflex PFR5-421 Rear Subframe Rear Mounting Insert kit. This Powerflex polyurethane bush insert is the go-to suspension upgrade for sharper handling, improved stability and reduced subframe movement on the BMW E90, E91, E92 and E93 platforms. Ideal for daily road use, fast road driving and track day prep, these poly bushes control unwanted flex in the rear subframe without the excessive noise or harshness often associated with solid bushes.
Powerflex poly bushes are engineered to improve road holding and chassis performance by limiting subframe deflection. More precise location of the rear subframe means better turn-in, more consistent rear-end grip, improved braking stability and more even tyre wear. Correctly formulated polyurethane can match or exceed OEM rubber for NVH control while maintaining performance and longevity. This is a proven, cost-effective BMW suspension upgrade that delivers real-world results.
Fitment
- BMW 3 Series E90 Saloon 2005–2013
- BMW 3 Series E91 Touring 2005–2013
- BMW 3 Series E92 Coupe 2006–2013
- BMW 3 Series E93 Convertible 2007–2013
- Position: Rear Subframe Rear Mounting Insert
Part Details
- Part number: PFR5-421
- Diagram reference: 20
- Number of bushes in the pack: 2
- Type: Insert to be used with the OE rubber bush
- Full replacement option available: PFR5-422
Why choose Powerflex PFR5-421 for your BMW E90, E91, E92, E93?
- Reduces rear subframe movement to sharpen handling and steering response
- Improves traction and braking stability for safer, more predictable performance
- Helps minimise uneven tyre wear and prolong tyre life
- Durable polyurethane bushings outlast standard rubber bushes
- Cost-effective BMW suspension upgrade with excellent value
- Lifetime warranty from Powerflex
Real-world results
We have installed Powerflex PFR5-421 rear subframe inserts on multiple E9x 3 Series builds and customer cars. Feedback is consistently positive: tighter rear-end control, more confidence on bumpy roads, and a noticeable reduction in subframe movement without unwanted noise or harshness. A simple upgrade with a big impact on how the car drives.
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Fitting and support
Professional fitting recommended. Nforcd offers expert installation at our workshop in Warwickshire. Request a fitting quote: Sales@nforcd.com
Notes
- PFR5-421 is an insert used with the existing OE rubber bush for quicker install and minimal NVH.
- For a full replacement bush solution use Powerflex PFR5-422.