[Plastic_Fork]

If you cut the springs now you have a spring that is not coiled properly and will affect your ride quality as well as your ride height. You also risk blowing out your shocks if you don't replace them with something aftermarket to withstand the new pressure on your suspension created by lowering the car's center of gravity and to keep the car from rolling too much in turns now that you have half a spring to support the same OEM shock that was designed for a full spring.

Hope that helps clear it up. In short, get new lowering springs and shocks or some decent coilovers if you want it done correctly.