Dinan Performance Spring Set for BMW X3 M40i / X4 M40i 2018-2025

Enhance the driving dynamics and presence of your G01 X3 M40i or G02 X4 M40i with the Dinan Performance Spring Set, engineered to deliver a sportier stance and sharper handling. This comprehensive set lowers the vehicle 7/8" (22mm) front and rear, while a calibrated 25% increase in spring stiffness dramatically reduces body roll for more responsive cornering. For the advertised ride quality, proper handling, and to maintain product warranty coverage, this spring set must be paired with the corresponding Dinan Supplemental Ride Quality and Handling Kit.

Key Benefits:

• Sharper Handling & Control: A 25% increase in spring stiffness provides a substantial reduction in body roll, dive, and squat for more precise and confident handling.

• Improved Aggressive Stance: Lowers the vehicle 7/8" (22mm) in the front and rear for better suspension geometry and a more planted, athletic appearance.

• Preserved Ride Compliance: When installed with the required Supplemental Handling Kit, the system maintains suspension travel to balance performance with daily-driving comfort.

Detailed Features & Important Notes:

• Lowering: 7/8" (22mm) front and rear.

• Spring Rate: 25% increase in stiffness front and rear.

• Spring Design: Includes (2) front linear-rate springs and (2) rear dual-rate springs.

• Performance Result: Substantial reduction in body roll.

• Construction: CNC-wound from high-tensile chrome silicon wire, shot-peened, and preset to prevent sag.

• Critical Requirement: The Dinan Supplemental Ride Quality and Handling Kit is required for proper operation, advertised ride height, and to maintain product warranty coverage. Claims related to poor ride quality or improper handling due to not using the kit are not warranted.