Eibach ERS 80mm Length x 60mm ID Coil-Over Spring (80-60-0140) Spring Rate:1027 lbs/in The ACT performance street rigid-hub

The ACT performance street rigid-hub discs feature premium organic materials with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability

Hand-crafted carbon fiber rear diffuser

2015 BMW M4 Convertible (w/o Adaptive M Suspension)

OE-style design engineered to meet or exceed factory standards for fitment and performance

Eibach ERS 80mm Length x 60mm ID Coil-Over Spring (80-60-0140) Spring Rate:1027 lbs/in The ACT performance street rigid-hubCoilover Spring by Eibach A properly tuned spring system provides the muscle needed to transform the power derived from the engine of a racing car to the track through optimum adhesion. Suspension tuning is a precise balance. On one hand, the spring system should be soft enough to compensate for road irregularities assuring permanent road contact, while on the on the other hand the spring system must be firm enough to reduce the body roll, squat, and