First, hats of to my friends at FD for taking the time to respond in elaborate detail the science behind their setup. I don't see any other manufacturers doing this.
I am the result of a FD sport spring setup. I did extensive research on this so I can save you all a lot of effort. There is no comparison here. FD is the only tested solution to lowering our car. They have this dialed in. My car was set up to perfection. Look at the stance! The drive is equally as perfect. No scraping. No issues. Quality is top notch. You won't find a better fitment so take advantage of their holiday sale and pull the trigger now. While your at it look at their DBW, Big brake kit, rear spoiler, Sport Exhaust, etc. I have it all and love it! Thanks FD!