Powerflex PFR5-1921 Polyurethane Rear Subframe Rear Bush Insert Kit (2) for BMW 1 Series F20/F21 xDrive | Fits OE Bush 33316792510 | Suspension Handling Upgrade

Sharpen rear-end control on your BMW xDrive with premium poly bush inserts

Give your F20 F21 all-wheel-drive 1 Series the planted, confidence-inspiring feel it deserves. This rear carrier insert kit limits unwanted rear cradle movement for cleaner turn-in, better traction out of bends and a more connected chassis on fast road and track. We have fitted these on our own cars and for customers, and the feedback is consistently excellent.

Fitment and key identifiers

• Part number: PFR5-1921
• Location: rear crossmember rear mounting point. Insert design works with the factory rubber bush
• Vehicle: BMW 1 Series F20 F21 xDrive models
• Replaces voids in OE bush reference: 33316792510
• Quantity in kit: 2 inserts
• Powerflex diagram reference: 21

Why enthusiasts choose this upgrade

• Controls subframe shift by filling voids in the original rubber mount for precise rear axle location
• Improves steering response, rear stability and overall balance under acceleration and braking
• Helps maintain consistent geometry for more even tyre wear and better road contact
• Durable polyurethane construction for long-term performance
• Outstanding value with a lifetime warranty from the manufacturer

What you will feel

By reducing deflection in the rear carrier mounts, the back of the car stays composed when you load it up mid-corner or get back on the throttle. Expect a tighter, more predictable rear end and clearer feedback without the cost or downtime of pressing in full replacement bushes.

Real-world results

Installed by MJ Modifications on multiple BMW xDrive platforms, this insert kit consistently delivers crisper handling and a more planted feel. Owners report improved stability and confidence, especially on spirited drives and track days.

Box contents

• 2 x rear carrier insert pieces for the rear positions
• Fitting instructions

Installation and support

This is an insert kit that works with the existing OE mount. For professional fitting, alignment advice and setup, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk. A geometry check is recommended after installation.

Buy with confidence

• Genuine Powerflex product
• Lifetime warranty
• Trusted by drivers for precision, durability and performance gains

Common searches and related terms

BMW F20 F21 AWD rear cradle inserts, rear axle carrier bush insert kit, BMW 1 Series xDrive rear crossmember polyurethane inserts, PU bushing upgrade BMW 1 Series, rear subframe mount insert F20 xDrive, 33316792510 insert, performance chassis bushings, BMW handling upgrade UK, track day suspension upgrade BMW xDrive, fast road rear bush inserts, polyurethane suspension mounts BMW 1 Series, rear carrier void fillers, uprated rear chassis mounts, BMW F20 F21 all wheel drive bush kit, Powerflex PFR5-1921 insert pack.