BMW N52/N54/N55/B58 Engine Mount Insert

Please check model fitment and/or OEM cross reference numbers to verify that these parts will fit your car before ordering.

We are pleased to introduce PFF5-4020 BMW N52, N54, N55, B58 Engine Mount Inserts, intermediate alternatives to the BMW aluminum inserts and much stiffer full replacement engine mounts available on the aftermarket. Made in our Yellow 70A durometer material, they are designed to fit the voiding of the OE mounts snuggly to restrict engine movement with a minimal increase in NVH, perfect for those with tuned road cars. Their design and flexibility also mean they can be fitted to the vehicle without removing the engine mounts themselves. Reducing engine/transmission movement by way of upgraded inserts has the following benefits:

- Sharper throttle response

- Improved gear shifting

- More direct power transfer

- More balanced on/off throttle handling

- Prolonged life of the OE mounts

OE / OEM Cross Reference Numbers: 22116787659 (Left) / 22116855460 (Right) AND 22116760330 / 22116773744

A small increase in NVH, usually at idle, should be expected when stiffening the connecting mount between the engine and chassis. The harder the material used, the greater the NVH transmitted.

How to Choose Powerflex Bushings & Durometer

Powerflex bushings are available in different polyurethane durometers to suit street, performance, track, and restoration applications. The correct bushing depends on how the vehicle is used and the amount of stiffness and chassis control desired.

What Do Powerflex Bushing Colors Mean?

Powerflex uses different colors to identify polyurethane hardness, measured on the Shore A durometer scale:

Red – 65A
Yellow – 70A
Purple – 80A
Black – 95A

A higher durometer generally means a stiffer bushing with less deflection. Powerflex engineers select the appropriate durometer for each specific bushing application to balance performance, durability, and driving characteristics.

Powerflex Road Series – Street & Performance

Powerflex Road Series bushings are designed for street and performance vehicles. They reduce unwanted suspension movement compared with standard rubber bushings, helping maintain suspension geometry and tire contact with the road.

Road Series bushings are a good choice for daily driven vehicles, spirited street driving, and performance builds where improved handling is desired without using Powerflex's stiffest track-focused compound.

Powerflex Black Series – Track & Motorsport

Powerflex Black Series bushings use Powerflex's stiffest polyurethane compound and are designed for track and motorsport applications where maximum chassis and suspension control is the priority.

The Black Series material can be up to 80% more resistant to load than standard rubber and approximately 25% stiffer than Powerflex's purple performance material.

Choose Black Series bushings for dedicated track cars, race cars, and performance builds where minimizing suspension deflection is more important than maintaining street-oriented comfort.

Powerflex Heritage Collection – Classic & Collector Cars

Powerflex Heritage Collection bushings provide the performance and durability benefits of polyurethane while maintaining a more original appearance.

They use the same premium polyurethane technology as the Powerflex Road Series but feature a dark grey finish designed to resemble traditional rubber bushings.

Heritage Collection bushings are ideal for classic, vintage, and collector vehicles where improved suspension performance is desired without changing the factory-style appearance.

Which Powerflex Bushings Should I Choose?

For most street and performance vehicles, Powerflex Road Series bushings provide a balance of improved handling and everyday usability.

For dedicated track or race vehicles, Powerflex Black Series bushings provide maximum stiffness and chassis control.

For classic or collector vehicles where maintaining an OEM-style appearance is important, Powerflex Heritage Collection bushings are the best fit.