[fliprayzin240sx]

It could just be spring noise. Most suspension squeak from the spring compressing and the coils touching each other under compression.

Now if its a Popping sound, then it could be the spring seating itself. Some coilovers have this issue due to the way the spring and coilover are designed. If they have a notch where the spring is supposed to sit into, it could be popping on and off it when you turn.