Good deals can be found on used Predators, and they can do all the same things a new one can. I have seen them for $200 and less on other Mustang sites. Your current mods do not alter the generic tune that comes on a Predator out of the box, however they do affect your vehicle's performance characteristics (i.e. A/F ratio, etc.) after loading the tune just as they affect your stock tune. A custom tune is the best way to adjust your specific vehicle for the mods you have or may add in the future.