Dinan's Performance Spring Set replaces the factory coils on the X3 M40i and X4 M40i with two front linear rate springs and two rear dual rate springs, tuned for a 25% increase in stiffness front and rear. The set lowers the vehicle 7/8 inch (22mm) at both ends for tighter suspension geometry and a more aggressive stance. Each spring is CNC wound from high tensile chrome silicon wire and shot-peened for stress relief, then preset to prevent sag, reducing body roll and dive while sharpening steering response. The Ride Quality and Handling Kit is sold separately.
Specifications
| Type | Performance lowering spring set |
| Quantity | Set of 4 (2 front linear rate, 2 rear dual rate) |
| Material | CNC-wound chrome silicon steel wire, shot-peened |
| Spring Rate | +25% front and rear |
| Drop Height | 7/8" (22mm) front and rear |
| Part Number | D100-0942 |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2018-2024 | BMW | X3 | M40i |
| 2018-2025 | BMW | X4 | M40i |
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