Description
Take control of your rear-end stability with the MMX Performance Billet Differential Insert Set, designed specifically for BMW F2X and F3X chassis models. Engineered to reduce unwanted diff movement under acceleration, deceleration, and cornering, these precision-machined 6061-T6 aluminum inserts dramatically improve driveline response and suspension geometry without introducing noticeable noise or harshness into the cabin.
The stock rubber differential bushings allow excess movement, which can cause vague rear-end feel, increased understeer, and compromised suspension alignment under load. The MMX diff insert set solves this by filling the voids in the OE mounts, adding rigidity where it counts, and ensuring your differential stays planted—especially during aggressive driving or on-track use.
Designed and tested in the UK, these inserts are compatible with petrol, diesel, manual, and automatic variants across the F2X and F3X ranges. Installation is quick, fully reversible, and can be completed in under an hour with the differential still in place.
Low NVH, High Precision:
MMX has carefully tuned these inserts to provide noticeable performance gains without increasing NVH (Noise, Vibration, Harshness). Most users report little to no change in cabin comfort, making this one of the best low-impact upgrades for a street or track-driven BMW.
Key Features:
- Black anodized 6061-T6 billet aluminum construction
- Engineered to fill OE bushing voids, reducing excess diff movement
- Minimizes driveline slop during hard acceleration, gear shifts, and deceleration
- Helps maintain optimal rear suspension geometry under dynamic load
- Preserves ride quality with negligible increase in NVH
- Fully reversible, easy bolt-in installation with diff remaining in the car
- Stainless steel setter retaining hardware for durability
Applications:
- BMW F20 1-Series
- BMW F22 / F23 2-Series
- BMW F30 / F31 / F34 3-Series
- BMW F32 / F33 / F36 4-Series
