Bilstein is at the top of the heap in shock technology world wide. Their nitrogen filled separate chamber technology has been the standard of the shock industry for years. It was only a short time ago that the technology was allowed to be duplicated. We have used these Aluminum Body Bilstein Shocks as the core of our Coil Over package for years now. The valving was dialed in by LG and Bilstein shock engineers on the track and on the street. We Built valving for street cars and for the race car. Of course most of you know the success that we had on track with the Bilstein/LG Coil Over package, winning races against some tough teams and drivers. Our Coil over package that we have been building for over 15 years for the Corvette uses the best and highest quality Hypercoil springs. We know that the Corvette Market would accept nothing less than the best, so Hypercoil was our choice. Makes a great complement to our new G7 Sway bars!