MMX Billet Subframe Inserts For BMW F2X & F3X Vehicles

The MMX Billet Subframe Insert Kit is a precision-engineered solution designed to improve handling and stability on F-Series BMWs (F2X & F3X). By filling the voids in the OEM rubber rear subframe mounts, these billet aluminium inserts limit unwanted movement, helping to maintain correct suspension geometry and deliver sharper, more predictable dynamics.

Under load, BMW’s stock rubber subframe mounts flex, making the rear feel loose and vague, especially during hard cornering, acceleration, or launches. The MMX inserts solve this issue by eliminating slop in the mounting points without compromising ride quality or adding unwanted NVH (noise, vibration, or harshness).

Crafted from CNC-machined 6061-T6 billet aluminium, these inserts are built to last and will not wear over time. Installation is straightforward, fully reversible, and can be completed in under an hour, making this one of the most effective and affordable upgrades available for your BMW.

Key Features

• CNC-machined from high-strength 6061-T6 billet aluminium

• Fills voids in OEM subframe rubber mounts for reduced movement

• No increase in NVH — refinement remains intact

• Helps maintain correct suspension geometry under load

• Sharper, more stable handling and improved cornering response

• Quick installation with subframe in-situ, fully reversible

• Durable, long-lasting performance upgrade

Compatibility

• BMW 1 Series (F20/F21) – 2011–2019

• BMW 2 Series (F22/F23) – 2011–2019

• BMW 3 Series (F30/F31/F34) – 2011–2019

• BMW 4 Series (F32) – 2011–2019

All engine variants
Part Number: MMR12-6002

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

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All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.