Powerflex Black Series Rear Diff Front Mount Insert Bush (Pair) for BMW 1 Series F20 F21 2011-2019 | 95A Polyurethane Differential Bush/Bushing Upgrade | Fast Road/Track | Wheel Hop Reduction | Void Filler | Replaces OEM 33316792513

Race-spec rear diff front mount insert for BMW F20 F21. This urethane upgrade fills the voids in the factory rubber mount on the front side of the rear final drive, tightening the driveline for crisper throttle pickup, cleaner gear changes and far sharper rear-end control during hard launches, rapid direction changes and track use. Ideal for spirited road driving, club motorsport and time attack where consistency and traction matter.

We run these inserts on our own cars and customer builds. Feedback has been consistently positive for stability, traction off corner exit and reduced driveline shunt. If you want a tougher alternative to soft OE rubber that reins in diff movement without going to a full solid mount, this is the upgrade we recommend.

Key benefits

• Stiff 95 Shore A polyurethane compound for maximum control of final drive alignment
• Limits differential wind-up under load to reduce wheel hop and axle tramp
• Improves drivetrain precision during acceleration and on upshifts or downshifts
• Void-filling insert design works with the original bush for a secure, durable solution
• Track-focused performance with long-lasting material that resists oil, heat and wear

Product details

• Vehicle: BMW 1 Series F20 F21
• Location: Front position of the rear differential mounting
• Material hardness: 95A polyurethane
• Pack contents: Pair of inserts
• OE cross-reference: 33316792513
• Diagram reference: 27
• Intended use: Fast road and competition

Why buy from MJ Modifications

• Proven on our own cars and by happy customers on fast road and track
• Specialists in BMW chassis and drivetrain upgrades
• Honest advice, quick support and parts we trust

Professional installation

We offer expert fitting at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored quote and booking.

Common search terms

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Note: This hard compound insert prioritises control and may increase NVH compared to standard rubber. Focused on performance driving and motorsport.