Description
The 034Motorsport Billet Aluminum Rear Subframe Insert Kit addresses a common issue with the BMW F2X and F3X chassis: the factory rubber rear subframe mounts deflect under load. This flex causes a vague, loose feeling in the rear end, negatively affecting suspension geometry, increasing understeer, and reducing the effectiveness of aftermarket suspension upgrades.
These precision CNC-machined billet 6061 aluminum inserts fill the voids in the factory rear subframe mounts to limit subframe movement under load. They improve rear-end stiffness while preserving ride quality and avoiding any noticeable increase in noise, vibration, or harshness (NVH) inside the cabin. This results in a sharper, more connected driving experience with enhanced handling precision.
Designed to complement the factory rubber mounts, this kit was engineered using CAD software and extensively tested both in-house and by independent BMW enthusiasts to ensure significant handling improvements. Installation is quick, simple, reversible, and can be completed in under an hour.
Features:
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CNC-machined billet 6061 aluminum construction with clear anodized finish for durability
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Engineered to fill voids in factory rear subframe mounts for optimal fitment
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Maintains proper suspension geometry during cornering
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Reduces rear subframe movement during launches, acceleration, and shifting
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Improves shifting feel with crisper transitions
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Maintains ride comfort with virtually no increase in cabin NVH
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Straightforward installation requiring no modifications
What’s Included:
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2x Upper front inserts
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2x Upper rear inserts
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2x Lower front inserts
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2x Lower rear inserts
Associated (Recommended) OE Parts:
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4x Bolts, part number 33 30 6 793 892
Vehicle Fitment
This insert kit fits the following BMW models and years:
2-Series:
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228i (2012–2020)
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230i (2012–2020)
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M235i (2012–2020)
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M240i (2012–2020)
3-Series:
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320i (2012–2019)
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328i (2012–2019)
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330i (2012–2019)
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335i (2012–2019)
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340i (2012–2019)
4-Series:
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420i (2012–2019)
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428i (2012–2019)
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430i (2012–2019)
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435i (2012–2019)
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440i (2012–2019)
The 034Motorsport Billet Aluminum Rear Subframe Insert Kit is the perfect solution for BMW F2X and F3X owners seeking to improve rear chassis rigidity and suspension accuracy. By minimizing subframe mount deflection, it enhances handling, reduces understeer, and makes aftermarket suspension upgrades more effective — all while maintaining OEM-level ride comfort and noise levels.
The standard shipping rate applies to orders within the continental United States. If you intend to place an order outside of the continental US, please reach out to support@x-ph.com for assistance.
