I don't think it would effect the spring rate that bad. I may take another half coil off the rear to let it drop a little more. You could take half a coil to a coil off the front and you would be slammed. These springs are VERY soft so when someone is sitting in the car it drops another inch...it looks like I have sportlines. I will have someone sit in it tomorow and take a pic. You should have no problem cutting a little bit though if you desire lower.
I was wondering the samething,considering i got sportlines,and am slammed.But if i could get close to what my drop is,plus have weight transfer of 4 banger springs,that would be nice.But still not sure,because i love the ride of my stang with the sportlines .