Metaphorically speaking-(my opinion only)-If K-sport and bilstein coilovers were getting ready to drag down a quarter mile track, the outcome would look like this{K-sport would have bilstein on the jump, but bilstein has been known to release it's horsepower of reliability in the 1st quarter of the quarter mile track. Also Bilstein would have a lot more sponsors, because they have already proven themselves before. Now i'm not saying that K-sports isn't a good coilover, because they're(decent)-but not decent enough to go against Bilstein for an additional $200 smackeronies. you may ask--how do I know? My little brother lives in Colorado Springs, and he bragged to me about how they were the shizzie etc... Well-he has had the K-sport GT-Pro's fully adjustable system and it cost him around $1600 bones. One night he chose to take on a race challenge from some dude with a supra(crazy horses from what I've been told) anyway these PRO GT coilovers had a dampener that popped-----POPPED dont ask me how or why, but it popped. K-sport offered to replace them all-which is cool, but for $1600-binky bones, K-sport should have picked me up in a heli for all that trouble.