a cars suspension is designed to work at a certain ride height. If you lower the car, 3 things happen
1. You ride looks well wickid *****
2. you run out of suspension travel so when you hit a bump you crash
3. your tyre is no longer in the optimal orientation to the road
2. Can be solved with suspension units that are shorter than standard so you retain some bump (upward) movement after lowering. However.....shorter units also have less droop (downward) travel which is really important for bumpy roads and drive traction
3. is hard to solve and needs fundamental changes to the suspension design - the tyre will no longer be optimally orientated on the road and 'generally' the grip will be reduced.
Lowering a car also lowers the center of gravity which is a
help to handling. You will be able to get away with lowering maybe an inch but any more will likely start to have negative issues associated with it, unless you do additional mods to counteract this
but this is for performance/handling - thats my bag - others have other interests and priorities like getting the car low for looks etc - fine, I'm not knocking it, but dont expect the car to handle well