I want to compete in my first endurance rally in Feb 2013. Currently my rallye is fitted with Challenge spec Bilstens with -50mm springs (unsure of what make), and is too low at the moment! I was just wondering what springs people would recommend me to buy, whether it be through opinion or experience. If anyone could post a link that would be great! Also I have the baseline billies on the back, would you recommend I upgrade these?Thanks, matt.