I have a set of coilovers on my 02 wrx and the rears are making a awful noise....like metal to metal rubbing together, I don't know the make....but I cannot find another set like them, there are blue in colour with a large red adjustment **** on the SIDE near the base, they have eibach springs and tein pillow top mounts.....there is no signs of leaking or any evidence of rubbing......please help...!

 

For a start, check there is adequate pre-load on the springs. Raise the wheel clear of the ground and make sure the spring is still under tension and not moving in its seat.
As you don't know the make, it's difficult to suggest how to adjust tension if it needs it.

JohnD