Powerflex PFR5-421 Polyurethane Rear Subframe/Cradle Mount Insert Bushings Kit BMW 3 Series E90 E91 E92 E93 E9x (2005-2013) – Rear Axle Carrier Bush Inserts | Performance Suspension Upgrade | Fast Road/Track

Powerflex PFR5-421 Urethane Rear Cradle Mount Insert Kit for BMW E90, E91, E92, E93

Transform the way your E9x drives with the Powerflex PFR5-421 rear cradle mount insert kit. By reinforcing the rear axle carrier mounts, these precision-moulded polyurethane inserts reduce unwanted cradle shift, keep alignment more stable under load and deliver sharper response through bends. Expect tighter rear-end control, better traction out of corners, smoother braking stability and more consistent tyre contact. Ideal for spirited road use, fast-road builds and track prep where you want gains in control without the harshness you get from solid mounts.

Because PFR5-421 works with the factory rubber mount, you get a big improvement in chassis precision while maintaining near-OE comfort and low NVH. Polyurethane resists oil, fuel, road salt and heat, so it outlasts standard rubber and keeps your alignment geometry true for longer. This is a cost-effective, high-value handling upgrade that you will feel immediately.

Fitment

• BMW 3 Series E90 Saloon 2005 to 2013
• BMW 3 Series E91 Touring 2005 to 2013
• BMW 3 Series E92 Coupe 2006 to 2013
• BMW 3 Series E93 Convertible 2007 to 2013
• Location on vehicle: rear axle carrier rear mount insert

Part details

• Part number: PFR5-421
• Diagram reference: 20
• Quantity in kit: 2 inserts
• Type: insert used with existing OE rubber mount
• Full replacement alternative: PFR5-422

Why choose this upgrade

• Reduces cradle movement for crisper steering input and predictable rear-end behaviour
• Improves traction, reduces wheel hop and helps the car put power down more cleanly
• More stable braking and better mid-corner composure
• Can help minimise uneven tyre wear by keeping geometry steadier under load
• Durable polyurethane construction built for long life
• Backed by a lifetime warranty from Powerflex

What our customers feel

We have fitted PFR5-421 on multiple E9x builds and client cars. Feedback is consistent — a more planted rear end, improved confidence on bumpy B-roads and a noticeable cut in cradle shuffle without intrusive noise. A small change that delivers a big step in control.

Ideal searches for this product

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Fitting and support

Professional installation recommended. MJ Modifications offers expert fitting at our Warwickshire workshop. For a quote, email info@mjmodifications.co.uk

Notes

• PFR5-421 is an insert that works with the standard rubber mount for quick installation and minimal NVH.
• If you prefer a full replacement bush, choose Powerflex PFR5-422.