most sport spring in the market is local/dunno-where made spring, they haven been through proper harden treatment, so the stiffness of sport spring is actually lower(softer) than stock/normal spring. It's NOT advisory to cut your sport spring. And give in mind, by lower your car ride, you will cause your absorber's bounce-re-bounce point went lower and might it get too low, causing your absorber didn't do it's job, hence your car will bounce like horsie ~ :D