Originally Posted by Bryan@Jlevi SW
RDSport co-designs their springs with the Pirelli Race Team. They also do product development for all of their suspension components (sway bars, struts, etc.) at the same time to maximize performance of each individual piece. While some spring manufacturers focus only on drop and minimal increase in performance, RD gives you the option to make the springs step one, and then continually improve the performance of your vehicle by adding their additional products. Here is a review from a 2009 issue of European Car Magazine sums up their focus on performance.
Ok, however I think you missed the point being made. The springs made for our cars are not developed with Pirelli's race team.