is it true that if i just change the spring (to lower) the car for cosmetic reason and not the entire coilover, say in a few months, SQUEAKY noises are very common?

what i mean is that squeaky noises can be heard from the inside but not exactly be able to pinpoint where it is exactly..........

 

never heard this...
am running eibach springs with stock shocks.
no noise, no differece from stock set up.

 

the stiffer springs will make the car make even more noise than it did before, especially from inside the car around the convertible top.

 

did you grease up the contact points before installing?