i have skunks , but you dont have to get new coilovers or springs. i was experienceing the same popping sounds when i first put on my coilovers, what you have to do is make sure that you put in the black plastic bearing thing on. you will find it on the black top cover from the front spring housing assembly that you took off in order to put in your new skunk coilovers. you will have to take off you coulovers inb order to put the plastic bearing in. after i did this there was no more popping or clunking whatsoever.
if your confused, or whatever let me know, i'll explain a little better, or even take pictures of what im talking about.