Do i have to change the strut when i get dropzone lowering springs on a 1995 nissan 200sx?

Yes, you should replace the shocks and struts. The factory shocks and struts on just about any vehicle had a tendency to blow out shorlty after the installation of lowering springs. You need to replaced them with shocks and struts that are designed for lowered behicled. Eibach has them and Koni makes good ones as well. You will also need to get your car aligned after lowering the car as it will increase your negative camber. If your factory suspension is not adjustable, then you will have to buy camber bolts to adjust the camber. If you do not do this, you will wear your tires out very quickly