Originally Posted by CFZ

I spoke to Swift about the noises and they sounded really confident that the OEM spring jacket was not on. I had no clue what they were talking about but they sent me a picture and apparently yours doesnt have it on. That will directly affect the squish noise. They assured me that it was tested on the Nismo and the springs will not cause any problems as long as installed correctly.
The reason why your vehicle is making noises is because the OEM spring jacket is not on the spring.