My fiancee just purchased the Sprintbooster for me for my 2014 GT. I mainly went with the Sprintbooster because it had free shipping plus it comes with the little cable and button to go from normal, 50%, and 100%. It sounds like these make the car more fun to drive and I don't want a tune while I'm still under warranty so this should do for now.
I should get it next week sometime.
2014 GT, Sterling Gray, base model, Automatic
GT500 AB, GT500 OTA pipes
Bob's oil catch can
Ford aluminum finned diff. cover
Ford all weather floor mats
Ford trunk liner and cargo net
Ford locking gas filler plug and wheel locks