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Roll Restrictor [Mk8 Fiesta ST]

The mountune roll restrictor for the Mk8 Fiesta ST reduces the amount of engine roll/movement during hard acceleration and gear-changes, whilst maintaining an acceptable level of NVH (Noise, Vibration and Harshness) for everyday use.

The EcoBoost engine found in the Fiesta ST generates a considerable amount of NVH due to its 3-cylinder architecture, and as such, the OE roll restrictor has had to be designed in a way to minimise this harshness. Unfortunately, this also means the engine movement is considerable and this translates as unwanted wheel hop /  tramping - which is unpleasant and detrimental to your car's overall performance.

Engineering an uprated mount to minimise this unwanted and performance-robbing characteristic, without filling the cabin with harsh vibrations, has been a challenge. But using our decades of high-level engineering knowledge, and previous roll restrictor experience, has enabled us to produce what we believe to be the ultimate balance for those wanting all of the performance benefits, without the unbearable vibration that the majority of other mounts exhibit - you'll still feel it, but not as harshly.

Machined from T-6061 billet aluminium, the mountune roll restrictor features unique mixed shore-hardness polyurethane bushes to counteract unwanted NVH and minimise vibration as much as possible, whilst still providing the required restriction in engine movement to enhance performance.


  • High quality anodised billet aluminium body
  • Bespoke mixed shore-hardness polyurethane bushes
  • Reduction in engine movement 
  • Prevents wheel hop
  • Minimal effect on NVH possible

Due to the additional NVH created when the VDE (cylinder de-activation) strategy is enabled, for all users already in our SMARTflash ecosystem, you can also claim a free cylinder de-activation version of your m225 / m235 / m260 (Fiesta) calibration - just specify your vehicle VIN in the notes section when checking out. and if the email used to make this purchase is different to the one used for your original SMARTflash purchase, please also supply that to ensure the industrialised calibration to support your vehicle is created and sent to you correctly.

Please note: A compromise has to be made, and some vibration at cold start and idle may be more noticeable on some vehicles.

Recommended torque settings: Subframe: 50Nm | Gearbox side: 45Nm.

Customer Reviews
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Filter Reviews:
    Steven S.
    United Kingdom United Kingdom

    Does the job

    Yes it vibrates a little more at idle but you soon forget it. With the M235 map it puts the power down so much better than without the roll restrictor. So, if you're thinking of doing it like I was, just do it. You won’t regret it.

    mountune Roll Restrictor [Mk8 Fiesta ST] Reviewmountune Roll Restrictor [Mk8 Fiesta ST] Reviewmountune Roll Restrictor [Mk8 Fiesta ST] Review
    Australia Australia

    Roll Restrictor

    Put the car on a mate’s hoist after work and had the old out and the new in within 15 minutes. Quality part. Dispatched and arrived in OZ in 5 days. One of the quickest and easiest mod’s I’ve done. Now off to test it out.

    mountune Roll Restrictor [Mk8 Fiesta ST] Reviewmountune Roll Restrictor [Mk8 Fiesta ST] Reviewmountune Roll Restrictor [Mk8 Fiesta ST] Reviewmountune Roll Restrictor [Mk8 Fiesta ST] Review
    Helen W.
    United Kingdom United Kingdom

    Roll restrictor.

    I simply cannot believe the difference this rear mounting has made. It feels like I have got a new car, with everything feeling nice and tight again. Although the gear change was always quite good, it hasn’t got that snicky feel anymore, I suppose the gearbox and linkage was dancing around together with the engine. I was expecting a small amount of vibration as other owners have complained about other manufacturers mountings vibrating quite considerably. I was most impressed with the quality of the product, almost too good to be never seen again.