Dinan's Performance Spring Set uses carefully calibrated rates to reduce body roll and lower the car for improved suspension geometry and a more aggressive stance. Each spring is CNC wound from high tensile chrome silicon wire, shot-peened for stress relief, and preset to prevent sag. Front stiffness increases by up to 95% and rear by up to 92% on the 330i depending on stock configuration, while the M340i and M440i xDrive receive targeted rear rate increases of 10 to 23%. The set drops ride height by roughly 5/8 to 1-1/8 inch depending on model and stays compatible with both conventional and factory electronic shocks.
Specifications
| Type | Performance lowering spring set |
| Material | CNC-wound chrome silicon steel wire, shot-peened |
| Drop Height | 5/8" to 1-1/8" front, 5/8" to 1" rear (varies by model) |
| Shock Compatibility | Conventional and factory electronic shocks |
| Part Number | D100-0934 |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2019-2026 | BMW | 330i | Base |
| 2019-2026 | BMW | 330i xDrive | Base |
| 2020-2026 | BMW | M340i | Base |
| 2020-2026 | BMW | M340i xDrive | Base |
| 2021-2026 | BMW | M440i xDrive | Base |
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