How aggressive are the springs?

In some cases the coils from a massive drop spring can come together during compression making a noise, creak or clang.

My Eibach prokits have rubber pads-sleves on the springs to prevent this but a very aggressive race spring may not as it's not truely intented for street use so noise isn't really a factor in most cases.

Eibach ERS springs (race duty) don't usually have the pads.....