how can i tell if they are blown? i got 2 struts with skunkworks coil overs the 2 rear and i am curious to see if they are worth putting in. thx

 

Usually you will see oil leaking or you can easily push the rod in.

 

one fast and simple way is push down on side of suspicious strut failure if it pushes now with force and bounces back up with ease it's good. If you push it down and stays down or bounces up slowly buy struts. So the only thing holding the end up while not dragging are the stock coils.