Powerflex Black Series Rear Subframe Front Bushing Insert (Rear Axle Carrier) - BMW F20 F21 F22 F23 F30 F31 F32 F33 F34 F36 incl. M135i M140i M235i M240i 335i 340i 440i xDrive - Polyurethane Cradle Mount - PFR5-1920BLK - Replaces 33316792509

Powerflex Black Series Rear Axle Carrier Front Insert – BMW F-Series Performance Handling Upgrade

Unlock sharper chassis response and rear-end stability on your BMW with this motorsport-grade rear axle carrier front insert. Engineered in 95A polyurethane, this race-compound insert locates inside the voids of the factory rubber mount to curb unwanted movement, control deflection and keep suspension geometry consistent under load. Ideal for road, fast-road and circuit use on F-series 1, 2, 3 and 4 Series models, including popular M Performance variants.

Part number: PFR5-1920BLK
OE cross-reference: 33316792509

Why this upgrade

• Reduces rear cradle shift for crisper turn-in and confidence mid-corner
• Improves stability under acceleration, braking and quick direction changes
• Motorsport-oriented 95 Shore A compound for precise axle location
• Durable polyurethane resists oil, heat and road contaminants far better than rubber
• Direct-fit insert design sits within the stock bushing housing for hassle-free installation

We run these inserts on customer cars and our own builds at MJ Modifications. Feedback has been consistently positive with drivers reporting a tighter rear end, cleaner power delivery and more predictable handling without resorting to a full solid-mount solution.

Compatible BMW platforms

Designed for F-series chassis using the specified rear axle carrier front mount. Suits rear-wheel drive and xDrive where applicable:

• 1 Series: F20 F21 including M135i and M140i
• 2 Series: F22 F23 including M235i and M240i
• 3 Series: F30 F31 F34 including 335i and 340i
• 4 Series: F32 F33 F36 including 435i and 440i

Perfect keywords for buyers: rear cradle insert, rear sub-frame front mount insert, F30 rear axle bush kit, F20 poly mounts, F32 handling upgrade, xDrive bush insert, BMW performance suspension bushings, track-spec poly bushing.

What is included

• 2 x Black Series polyurethane inserts for the front position of the rear axle carrier

One kit completes the front location on the rear subframe for one vehicle.

Technical details

• Compound: Black Series 95A polyurethane
• Function: fills OEM bushing voids to limit compliance and maintain alignment
• Use case: road, fast-road and track day applications

Diagram reference

Diagram position: 20

Looking for a road-biased feel

If you prefer a softer daily-driver option, check out the Road Series equivalent for a little more compliance while still tightening the rear cradle compared with worn rubber mounts.

Professional fitting

Installation service available at MJ Modifications in Warwickshire. For a fitted price or workshop availability, email info@mjmodifications.co.uk.

Fitment check

Provide your UK registration or last 7 of the VIN at checkout so we can confirm compatibility before dispatch.

Search-friendly terms

BMW rear cradle bush insert, rear subframe front mount insert, F20 F21 F22 F23 F30 F31 F32 F33 F34 F36 rear axle bushings, M135i M140i M235i M240i 335i 340i 440i poly bush kit, performance chassis mounts, polyurethane rear cradle insert, handling mod for BMW F-series, PFR5-1920BLK upgrade, replaces 33316792509.