i'm bangin track spec D2 coilovers too!! and they are one of the best handling mods i've done!! dropped the car heaps and great for hard cornering. mine don't make much noise at all... the only issue i had with them (and you'd get with any new springs) was that when i installed them i put them on a pretty low height setting, and a week later i was bottoming out everywhere! coz the springs work in/settle and the car drops a little bit... mine dropped about 3/4 of an inch! so if you put them on yourself, don't go too low straight up!

but a great package to get if your after great handling!