What if anything can the Predator tuner do? Are there any gains to be had for a totally stock 4.6? I'm just now reading about the tuners and it seems this one is everyone's favorite. It can correct the speedo I know, but what else? I'm afraid that the 4.6 is a new beast to me. I've owned 3 fox-body 5.0 cars, but this is my first mod-motored pony.