its never a good idea to lower on stock struts. and those look like cheap ebay springs. if you want a good quality setup tokico d-spec struts with eibach sportlines if very popular.
and if your on a budget keep an eye on the classifieds and buy used.
Ive heard mostly bad reviews on those ones, they are "ebay springs"
What struts do you have?
2000 Cavalier Z24 5spd - Intake, Dynomax muffler, Hawk Pads, Powerslot rotors, Sportlines/Koni reds, Neon Coil, MSD 8.5 Wires - **SOLD**
2014 Kia Forte Koup SX 6spd - 1.6L Turbo - My new car
2015 Kia Sorento EX V6 AWD - Wifes Car