






MMX Performance - BILLET SUBFRAME INSERTS | BMW F2x | F3x
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Description
Designed and engineered in-house in the UK, the MMR rear subframe insert kit for the BMW F2x and F3x chassis is designed to limit movement in the factory rear subframe mounts to maintain proper suspension geometry when cornering and improve the responsiveness of the rear suspension and differential. Installation is very simple, can be performed in under an hour, and is completely reversible.
By filling small voids in the four factory mounts as well as limiting vertical movement, the insert set eliminates the associated slop to ensure that you experience a more refined, connected driving experience, especially when driving at the limit. The billet aluminium parts will not wear over time and offer a lasting performance improvement.

Worried about noise? NVH is a measurement of how much noise, vibration, & harshness gets transmitted into a vehicle’s cabin. Based on feedback, MMR inserts transfer little to none NVH into the cabin. NVH is subjective, so some users may find NVH to be increased or decreased from our rating. If you are experiencing higher than quoted NVH with this product, please evaluate the installation to ensure the components are installed correctly.
The BMW F2x and F3x series use rubber rear subframe mounts that deflect under load, causing the rear end to feel vague and loose, as well as leading to less-than-optimal suspension geometry and increased understeer. These precision-machined billet aluminium inserts are designed to fill voids in the factory rear subframe mounts, and limit subframe movement without sacrificing ride quality or introducing any perceivable additional noise, vibration, or harshness into the cabin. The result is a more refined, connected driving experience, as well as improved effectiveness of aftermarket rear sway bar upgrades and suspension components.
These inserts were tested extensively by MMR and independent BMW enthusiasts before release on multiple F2x and F3x vehicles. Our diff inserts fit diesel, petrol, manual and auto variants.
FEATURES
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Billet CNC - machined 6061-T6 Aluminium body
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Fills void in OE differential rubber bushings
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Practically no additional NVH transfer inside vehicle
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Easy install with differential remaining institute
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Reduces rear subframe movement during launches & acceleration
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Helps maintain correct suspension geometry under dynamic loading
FITMENT DETAILS
|
Series |
Model Code |
Year |
Variant |
|
1 Series |
F20/F21 |
2011 - 2019 |
All variants |
|
2 Series |
F22/F23 |
2013 - 2019 |
All variants |
|
3 Series |
F30/F31/F34 |
2011 - 2019 |
All variants |
|
4 Series |
F32 |
2014 - 2019 |
All variants |
More information
Get Booked in for fitting here
Warranty, Shipping and Returns
Warranty: Products are supplied with the applicable manufacturer warranty.
Shipping: We offer UK and worldwide shipping. Delivery estimates are shown above.
Returns: Eligible unused items can be returned within 14 days in accordance with our returns policy.
Finance Options
Klarna payment options are available at checkout where eligible.
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Specifications
- Brand
- MMX Performance (Formally MMR)
- Product type
- Suspension Linkages
- SKU:
- MMR12-6002
- Vehicle make
- BMW
- Vehicle model
- 340i, 440i, M135i, M140i, M235i, and M240i
- Vehicle variant
- F20, F21, F22, F23, F30, F31, F32, F33, F34, and F36

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Need help?
MMX Performance FAQs
Helpful answers before you order. Need more detail? Our team can help.
How do I confirm this part fits my vehicle?
Check the model, year, engine, chassis and any exclusions in the product description. Select the required option before adding to your basket. The vehicle selector helps narrow your search; contact us if your car has different factory options or existing modifications.
Can I order this for a modified car?
Existing modifications can change compatibility. Tell us which related parts are already fitted and how you use the car so we can help you check the right specification before ordering.
When will my order arrive?
Select your required option and check the live availability message above. Dispatch is when your order leaves us; delivery takes additional time and depends on the service and destination. If no verified lead time is shown, or you need the item for a fitting appointment or event, contact Nineteen72 Performance before ordering.
What is included in the price?
Check the product description, selected option and stated quantity before ordering. Images may show optional equipment or an example installation. If you need a matching pair, a complete kit or additional hardware, ask us to confirm exactly what is included.
How do I get help before ordering?
Contact Nineteen72 Performance with a link to this product and your question. For vehicle-specific parts, include your model, year, engine and any modifications that may affect compatibility.
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