Powerflex PFF5-4021 Engine/Motor Mount Insert Bushings Kit for BMW M3 F80 3 Series 2014-2018 (S55) - Road Series Yellow 70A Polyurethane Void Fillers - Reduce Engine Movement, Improve Throttle Response & Gear Shifts

PFF5-4021 Poly Motor Mount Insert Set - BMW M3 F80 2014-2018

Give your S55-powered M3 a tighter, more connected feel with this PFF5-4021 motor mount insert set. These yellow 70A polyurethane void fillers sit inside the standard hydraulic mounts to control powertrain rock, improving pedal response and shift precision on fast-road builds while keeping day-to-day refinement intact. A brilliant upgrade for the F80 saloon if you want a sharper drivetrain without stepping up to full solid mounts.

What you will feel

• Noticeably firmer engine support under acceleration and braking
• Cleaner upshifts and downshifts with reduced driveline lash
• More immediate throttle pick-up and power delivery
• Calmer drivetrain movement that inspires confidence on B-roads and track days
• Helps protect tired factory mounts by limiting excessive movement

Why this insert kit

As an intermediate solution, these inserts bridge the gap between soft OE mount compliance and the rigidity of full replacement mounts. You get a meaningful reduction in engine pitch and twist with only a small increase in NVH, typically most noticeable at idle. Ideal for tuned road cars that demand response and control without going harsh.

Details and specifications

• Brand and part number: Powerflex PFF5-4021
• Series: Road Series
• Material hardness: Yellow polyurethane, 70A
• Quantity in pack: 2 inserts
• Diagram reference: 20
• Fits into the voids of the original engine mounts

Vehicle compatibility

BMW M3 F80 3 Series saloon 2014-2018.

Replaces OEM mount references

22116787659, 22116855460, 22116760330, 22116773744

Installation

Can be fitted with the OE mounts still on the car, making this a straightforward upgrade. A small increase in vibration and cabin feedback may be present, particularly at idle, as stiffness is increased between the engine and chassis.

Prefer professional fitting? MJ Modifications in Warwickshire can help. Request a quote at info@mjmodifications.co.uk.

Tried and trusted

We run these inserts on our own builds and have installed them for many customers. Feedback is consistently positive, highlighting crisper shifts, better throttle response and a more planted, predictable drivetrain feel.

Search-friendly terms

BMW F80 M3 motor mount inserts, engine mounting bush upgrade, polyurethane mount insert kit, drivetrain mount bushes, torque mount insert, F80 M3 S55 engine support, gearbox stability improvement, performance poly bushes UK, BMW M3 3 Series 2014-2018 engine mount upgrade, Powerflex PFF5-4021 insert.