dse subframe coil over

[frankv11]

just ordered my dse sub and Im contenplating on changing the front coil over sprigs from 450lbs (recoomended by dse for LS motor ) I will be running ls6 with magna charger. I remember reading some where on site that the 550lbs will perform better
Im planning on using this car mostly on street but will definetly get it out to the autocross race it as much as possible
if any body has some experience with this would appreciate your imput