Nothing to do with the coilovers being old or new. I experienced this with brand new components as well.
When the spring compresses or decompresses, the top and bottom that contacts the spring perch and top hat. It is metal on metal which is what creates noise.
Certain super high end coilovers (basically, not the Tein Flexes) may have special coating on the springs OR a radial bearing built into the spring perch, but by and large, there is nothing in between the spring and the perch/hat. Again, its metal against metal = friction = noise
so again, if the noise resembles a popping or creaking or sharp squeal during compression, then that is the issue
that might not be it
or you can ignore me
either way
good luck
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