3cm is quite a lot for a car which already only has 11cm clearance
I m just a bit in doubt ...
get the whole nismo kit, or only the rear spoiler ...
from a "development" point of view all the parts are ment to be used together (downforce etc) so it would seem a bit silly to just put on the spoiler, which creates more downforce at the back, but not at the front, thereby destabilizing the front at high speeds