034Motorsport BMW F2x/F3x F-Series Rear Subframe Bush/Bushing Insert Kit - Billet Aluminium CNC Machined - F20 F21 F22 F23 F30 F31 F32 F33 F34 F36 - Rear Axle Carrier / Rear Cradle Inserts - 1 2 3 4 Series

Unlock sharper rear end control on your BMW F-series with 034Motorsport’s precision CNC-crafted alloy rear axle carrier inserts. By filling the cavities in the OE elastomer bushes, this clever insert set dramatically cuts cradle compliance, keeps alignment consistent mid-corner and gives you that planted, confidence-inspiring feel without adding noticeable noise, vibration or harshness in the cabin.

Perfect for spirited road driving and performance builds alike, these billet aluminium carriers work alongside the factory rubber mounts to deliver a tighter, more connected chassis. Expect crisper gearchange sensation, improved traction on acceleration and a more predictable balance that reduces the vague, floaty sensation at the back of the car.

Why choose this upgrade

• Transforms rear axle stability for BMW F2x and F3x platforms
• Fills voids in OE bushings to minimise rear cradle movement under load
• Keeps suspension geometry consistent when cornering for confident turn in
• Noticeably improves throttle-on composure during launches and acceleration
• Tighter, more precise shift feel thanks to reduced drivetrain twist
• Near zero additional NVH, ideal for daily use
• Direct fit with factory mounts, fully reversible

Engineering and finish

• 6061-T6 billet aluminium construction
• Precision CNC machined for exact fitment
• Clear anodised for corrosion resistance and durability
• CAD designed, developed and validated by 034Motorsport with extensive enthusiast testing

Compatibility

For BMW F2x and F3x chassis, including:

• 1 Series F20 F21
• 2 Series F22 F23
• 3 Series F30 F31 F34
• 4 Series F32 F33 F36

Works with the original rubber rear axle carrier mounts. A highly effective handling upgrade that pairs brilliantly with performance springs, dampers and anti roll bars.

What you get

• 2 x Upper front inserts
• 2 x Upper rear inserts
• 2 x Lower front inserts
• 2 x Lower rear inserts

OE cross reference

Front bushing: 33 31 6 792 509

Rear bushing: 33 31 6 792 511

Recommended OE hardware

Bolts, qty 4: 33 30 6 793 892

Installation

Simple bolt in fitment that can be completed in under an hour and is fully reversible. Our workshop has fitted these on multiple F series cars with excellent feedback on road manners and handling precision.

Want professional fitting We offer installation at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.

Search friendly terms

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