Bought some used coilovers, Zeal Function V6's.

Stripped them down to check all parts, all in A1 condition no leaks and pistons move freely.

Came to fitting to car, all went in with ease.

After I took car for a test drive and there is an loud clunk, bang, knock when going over bumps sound is coming from the rear.

I've read all the threads i can find, and it appears this is just something you can expect from coilovers, especially track oriented stiff setups.

My question is this actually normal, and do you just deal with it, or is there something to worry about that could damage car?

Thanks