While we are on the topic of Bilsteins. What is the difference between HD and Sport? I am planning to upgrade on my e-30 and need some of that group knowlege. Anything I do will be an improvement, my shocks are toast, but because I live in a pot-holed metropolis I can't have a track only suspension. I'm also looking at a plus 1 tire package from the Tire Rack. Thanks, Josh ------------------------------