according to the nissan manual

Coil Springs
Coil Springs are utilised to support the weight of the vehicle & they provide for the basic ride height of the
vehicle.
HBMC does not in anyway alter the ride height of the vehicle. The ride height is preset via the use of the
Coil Springs.

So this being the case, whats the big deal about fitting higher lift springs to the Ti Nissan patrol with HBMC

I am about to purchase one of these and need some help