Performance M
Powerflex PFR5-4613 Rear Subframe/Cradle Bush Insert Kit – Polyurethane Subframe Mount Inserts – BMW E46 3 Series & M3, Z4/Z4M E85 E86, X3 E83 2003-2010 – Rear Axle Carrier Crossmember Bushing Upgrade
Powerflex PFR5-4613 Rear Subframe/Cradle Bush Insert Kit – Polyurethane Subframe Mount Inserts – BMW E46 3 Series & M3, Z4/Z4M E85 E86, X3 E83 2003-2010 – Rear Axle Carrier Crossmember Bushing Upgrade
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
Couldn't load pickup availability
Uprated Rear Crossmember Bush Insert Kit | Powerflex PFR5-4613
Give your BMW a proper chassis upgrade with these polyurethane rear crossmember rear bush inserts from Powerflex. The PFR5-4613 kit tightens up the rear axle carrier, cuts excessive movement in the mounts and delivers crisper steering response, stronger traction and far greater stability under braking and cornering. Ideal for fast-road and trackday use while remaining civilised for daily driving thanks to high quality polyurethane that resists heat, oil and ageing.
Why enthusiasts choose this upgrade
- Sharpened turn-in and noticeably firmer rear-end control
- Reduces rear cradle deflection for more consistent geometry
- Improves grip and traction, helping to reduce wheel hop
- More predictable behaviour on bumpy B-roads and during hard braking
- Poly bushes that outlast standard rubber, aiding tyre life and alignment consistency
- Backed by the Powerflex Lifetime Warranty
Part details
- Part number: PFR5-4613
- Diagram reference: 11
- Quantity: 2 inserts
- Design: inserts that locate into the voids of the factory rear crossmember rear mount, so no need to press out the original bush
Compatibility
Direct fit for BMW platforms using this rear axle carrier arrangement:
- E83 X3 2003 to 2010
- E46 3-Series including E46 M3
- E85 E86 Z4 including Z4M
Perfect for owners wanting a simple sub-frame mount insert solution that tightens the rear without the hassle of fully replacing the OE bushes.
What to expect on the road
We have installed this kit on our own cars and for many customers. Feedback is consistently positive, with a planted rear axle, better confidence on turn-in and more stable braking. The car feels more connected without introducing harshness when paired with healthy OEM mounts.
Why polyurethane
Correctly engineered polyurethane controls unwanted compliance in the suspension so the dampers and springs can work effectively. It maintains geometry under load, withstands contamination and heat better than rubber and provides long service life while keeping noise and vibration in check.
Installation
These inserts fit into the voids of the existing rear crossmember rear mounts, making this an accessible upgrade. Professional fitting is recommended. For expert installation, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
Cross references
OE numbers commonly associated with the original mount: 33316770781, 33312283419.
Also searched as
poly bushes for rear axle carrier, rear cradle mount inserts, sub frame bush upgrade, performance suspension mounts, E46 handling upgrade UK, E83 X3 rear axle mounts, E46 M3 rear cradle bushings, Z4 rear crossmember inserts, polyurethane suspension kit, trackday suspension upgrade, fast road bush kit, BMW rear axle carrier reinforcement aid, chassis stability upgrade.
Share
