Powerflex PFF5-4021 Engine/Motor Mount Insert Bush/Bushing Kit for BMW M4 F82 F83 (4 Series) S55 2014-2020 - Road Series 70A Polyurethane Void Filler - Reduces Engine Movement & Drivetrain Lash, Improves Shift and Throttle Response

Powerflex PFF5-4021 Poly Bush Motor Mount Insert Kit for BMW M4 F82 F83

Unlock a tighter, more connected drive in your BMW M4 with this Powerflex PFF5-4021 motor mount insert kit. These high-quality polyurethane void-filler bushes stabilise the powertrain, cutting excess engine rock under load for cleaner gear changes, quicker throttle pickup and more consistent power delivery on the road.

Made in Powerflex Yellow 70A Road Series material, the inserts press into the cavities of the factory mounts to reinforce them, giving you control and precision without the harshness of full solid replacements. Installation is typically possible with the original mounts still in place, making this a fast, cost-effective upgrade that pays off every time you accelerate, shift or change direction.

We run this kit on our own builds and customer cars, and the feedback is brilliant: reduced driveline slack, crisper shifts and a noticeably more planted feel during acceleration, braking and cornering.

Part number: PFF5-4021

• Road-friendly 70A polyurethane for a great balance of comfort and control
• Helps minimise engine twist and drivetrain lash for improved shift precision
• More immediate throttle response and better on-off throttle stability
• Supports longevity of the OE mounts by reinforcing mount voids
• Usually installs with mounts on the car, saving time and labour
• Ideal for fast road and tuned street setups seeking sharper feedback

Vehicle compatibility

• BMW M4 F82 Coupe
• BMW M4 F83 Convertible
• Diagram reference: 20

Equivalent OE mount references for compatibility guidance

• 22116787659
• 22116855460
• 22116760330
• 22116773744

What you get

• 2 x Road Series polyurethane insert bushes

Real-world results

• Noticeably steadier powertrain under load and during shifts
• More direct power transfer and gear engagement consistency
• Small increase in noise, vibration and harshness at idle is normal when firming up mount points

Fitting and support

We recommend professional installation. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Why buy from us

• Tried-and-tested on our own cars and customer M4s
• Great feedback on drivability, shift feel and overall refinement
• Trusted upgrade from a leading performance bush specialist

Search-friendly terms customers use

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Give your BMW M4 the control it deserves with the Powerflex PFF5-4021 insert kit. A simple, proven upgrade that tightens your drivetrain and enhances every drive.