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.
| 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 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
