BILSTEIN damper and EIBACH Pro-Kit - performance spring road-tested and fine-tuned to perfectly complement each other Precise responses, excellent driving dynamics and added safety. If you're looking for the perfect combination of sport dynamics, superior appearance and high performance for your car, you're on the right track with the BILSTEIN B12 Pro-Kit. This suspension kit provides a dramatic increase in your vehicle's performance handling characteristics and is designed for drivers wanting precision control and superb driver comfort, while seeking out more curves to conquer. The B12 Bilstein B12 Pro kit is a high performance system that includes four Eibach Pro Kit coil springs with a specially-tuned spring rate and Bilstein's monotube gas pressure shocks or struts featuring valving specific to your vehicle. The B12 system provides a lower stance and more stable ride for better road handling and control. This is the most economical way to vastly improve your car's performance AND appearance. (yellow paint, steel body) Product Features:Professional Cornering System (PCS)Precise response, excellent performance and predictable controlLowering up to 40mmProvides for a lower, action-ready looking vehicleMonotube gas pressure technologyInverted tube technology eliminates rod flex and provides unmatched lateral stabilityEIBACH Pro Kit application specific progressive rate performance springsTriple-C Technology Gas Pressure Technology Over time, the mono-tube gas pressure technology developed by BILSTEIN has established itself as a standard in automotive construction. This technology involves keeping the oil in the absorber under pressure, which prevents it from foaming when temperatures and loads are increasing. As a result, full damping power is retained even when the system is placed under extreme stress, a feature that can be observed in the self-lowering piston.Ensures a high level of traction and more precise handlingA must-have for powerful sport suspensionsAdded safety in all dynamic driving situations BILSTEIN's mono-tube technology The original and best: The original mono-tube gas pressure shock absorbers bore the BILSTEIN name, and we're still responsible for producing the best there is. BILSTEIN's mono-tube technology is the number-one choice in motorsports and series-production sports cars: no other type gives engineers the same freedom to choose the perfect installation location or position (e.g. Upside-Down technology).Large effective surface on the working piston creates increased damping power and better handlingImproved dissipation of thermal energy outwards enables a consistently high level of absorber performanceSturdy structure for added safety in Upside-Down Technology