spring question
 

what is needed for springs off of an 05 gt to work properly on a 14 gt? springs are sportline springs

I had a set of Prokit spring on my car from a 05-09 and they worked fine. The porch is a little different on the struts from 05-09 than your 10-14, but it didn't mess with the ride quality on my car.

BTW, Sportlines are extremely low and somewhat of a harsh ride. I'd do more research before purchasing them to see if it's something you'll be comfortable with.