its a simple princple of physic. the lower ur car, the lower centre of gravity thus reducing the amount of roll during cornering.
that's the advantage if the car is lowered properly, like using custom made springs instead of potong spring only. in potong spring cases, the car height is reduced but cant be increased (unless u buy a new coil) and the spring will rebounce irregularly and make it difficult to manouvre for example a fast corner but with uneven surface.
at times, we look at cars like they had been lowered tremendously. well, dont be deceived by our eyes perception. if u got a standard wira or waja, installed full skirting and ppl will say that u already dropped an inch or two of the ride height. easy isnt it?