Powerflex PFR5-1927 Polyurethane Rear Differential Front Mount Insert Bush Kit for BMW 1 Series F20 F21 - Diff Bush/Bushing Upgrade (Pair) OE 33316792513

Part Number: PFR5-1927

Upgrade your BMW’s rear-end control with a polyurethane differential mount insert

Give your BMW 1 Series F20 F21 sharper traction and a more planted feel by reinforcing the front mounting point of the rear differential. This pair of polyurethane inserts fills the voids in the factory rubber mount to curb unwanted movement under load, helping your driveline put power down more cleanly during hard acceleration and spirited driving.

Why enthusiasts choose this differential mount insert

• Reduces differential movement under throttle for crisper response
• Helps minimise axle tramp and wheel hop when launching
• Improves traction out of corners for fast-road and track-day use
• Durable polyurethane resists oil, heat and age-related degradation
• Insert design works with the existing OE bush for balanced NVH
• Backed by a lifetime warranty for peace of mind

What you get

• Quantity: 2 inserts
• Diagram reference: 27
• Position: front mounting point of the rear differential

Fitment

Designed for BMW 1 Series F20 and F21 models. This is an insert kit that fits into the original rubber mount to fill the voids. No need to remove the OE bush.

Our experience

We have installed this upgrade on customer cars and our own builds, and the feedback is consistently positive. Drivers report a tighter rear end, improved traction and a more connected feel without making the car unpleasant on the road.

Fitting service

Professional installation available at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and lead times.

Cross reference

OE reference: 33316792513

Search-friendly terms

BMW F20 F21 differential mount insert, rear axle diff mount upgrade, BMW 1 Series rear differential front mount, polyurethane bushing insert kit, driveline stabiliser, diff bush insert, suspension bush upgrade, performance chassis parts UK, track day suspension upgrade, fast road handling upgrade.