heh yea i had a set of those cheap e-bay coil overs on my last car. they suck! for one it's just a threaded sleeve that goes over your existing shock, and they give you rubber o rings to fit to size. the spring rate is ridiculously too high... count on not trying to drink with a straw unless you want to get speared in the back of your mouth! and you cant lower them up to four inches, i think the total drop was like 2, because the lock mechanisms are about an inch tall and the spring rests on those!
bottom line..... just buy real ones.