The 2015 5.0 is my third GT.. I lowered my two others ('05 GT, '12 GT) and got the Maximum Motorsport CC plates for those two. I got my '15 GT with the GT Performance package. Are CC plates needed for such a mild drop on the '15? I am on a staggered set-up, always have been, that's why I always got CC plates so I wasn't forking out new tires all the time. What's your opinion?
If I understand the specs listed for the install you should be within specs on caster camber and toe. You will get a little more negative camber, a little toe in and a little more caster, but all within specs. The toe in can easily be tweaked, but without caster/camber plates there is no adjustment for caster or camber on this car. You can probably get the cammed camber bolts to tweak the camber if that is your concern. I suspect if you take it to an alignment shop all will be well. They may tweak the toe ever so slightly but I suspect they will leave it alone. I plan to have mine checked just to be sure and get camber bolts if necessary, I will not spend the $$ on the plates as I would not be concerned with the slight change in caster.