So after getting my gt a couple days later i removed the factory gt spoiler, i think it looks way better, but does it really help? I noticed at higher speeds that the back end felt kinda loose. Since then i have add ford k spring but have not had another chance to get out. Also i plan on going to a 285/40/18 rear will this help with the loose feeling in the rear?

 

The GT spoiler is pretty much useless except for aesthetics.