The lift kit will change the angle of the front shaft, which can and probably will cause premature wear of your cv joint, the springs will do nothing but restore the normal height of the quad, and cannot increase the lift more than the length of the shock not hurting anything. IMO Over time the front springs sag, that is why people with older quads can see a lot of lift from the springs while someone with a new quad will complain about the springs doing nothing for them