Powerflex Upper Engine Mount Insert Kit BMW F4X, F52, F39


PFF5-1321 Upper Engine Mount Insert are a simple, but effective rod design made from our Yellow 70A material. They fill the key voided areas of the mount to restrict engine roll, providing the perfect balance of compliance and rigidity, making them ideally suited for your daily driven vehicle. As the vehicles age and simple upgrades seeing the2-ltrturbo engine push power north of 250bhp, the OE rubber engine and transmission mounts are showing their age, with cracked rubber and excessive movement.Designed to fit within thevoiding of the original mount, these newinserts prolong the life of the OE mount by stiffening and limiting movement of therubber. This results in a moresettled transmission response during acceleration and deceleration, improving gear changes and reducing wheel-hop.The effective rod design made from ourYellow 70Amaterial.Theyfillthe key voided areas of the mount to restrict engine roll, providing the perfect balance of compliance and rigidity, making themideally suited for your daily driven vehicle.

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Time to do some sums…

WHY POLYURETHANE SUSPENSION BUSHES?Polyurethanes have been with us since the late 1930s, however, recent advances have now made it possible to engineer very special properties into this exciting material.

Suspension bushes are some of the most highly stressed components fitted to a motor car. They undergo enormous strains and in the most arduous of conditions with no maintenance or lubrication.

The material they are manufactured from is a rubber compound containing natural products that deteriorate with age. It becomes softer and more pliable, resisting the forces placed on it less and less. Therefore allowing more and more movement of suspension components and offering less and less control over the suspension geometry.

This in turn causes accelerated tyre wear, braking instability, and poor handling. This is the single biggest reason you can instantly tell the difference driving a three-year-old car compared to a showroom new one. However, even new cars will benefit from POWERFLEX bushes because of the superior design they offer much more effective control of the suspension components to a much greater extent than normal rubber items.

With the technological advances in this material, it has been possible to overcome the common problem associated with harder bushes which is increased noise. By correctly engineering the polyurethane compound, bushes can be made 25-30% stiffer than new rubber items but with exactly the same noise absorbing properties.

  • POWERFLEX bushes make sense.
  • POWERFLEX for improved performance.
  • POWERFLEX for increased safety.
  • POWERFLEX for prolonged tyre life.


Additional information

Weight 10 kg


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Chassis Version

F3X, F4X, F5X

Powerflex Bushes

Black Series, Road Series