MMR Performance | Billet rear subframe inserts | BMW

At PERON Automotive, we focus on upgrades that deliver real performance without unnecessary complexity. The MMR Performance Rear Subframe Bush Insert Kit is exactly that—an easy-to-install, high-impact suspension upgrade for your BMW F-Series (F2x & F3x).

The factory rear subframe mounts allow for more movement than ideal, especially during hard cornering. This can lead to inconsistent handling and compromised suspension geometry. MMR’s precision-machined inserts limit that movement, sharpening response and improving rear-end stability—without the need for harsh solid mounts.

Installation is quick—under an hour—and completely reversible, making it a perfect upgrade for daily drivers and performance builds alike.

Key Features:

• Designed for BMW F2x & F3x platforms

• Reduces unwanted rear subframe movement

• Maintains proper suspension alignment under load

• Improves cornering response and rear stability

• Installs in under an hour, no subframe removal needed

• Fully reversible for lease or resale purposes

Whether you're fine-tuning your road car or prepping for track days, this bush insert kit is a must-have to unlock the true potential of your BMW’s chassis.