Don't get your hopes up too high with a remap. This is not a turbocharged engine...
In fact, it is already relatively high on its power (most powerful NA fire-engine), fiat uses turbo's to take more power from these engines.
Easiest way to improve power is a t-jet engine (the easiest engine-swap is a car-swap).
This does not mean it is not possible to gain some extra power from this engine (formula750 has more power from from a smaller fire-engine), but you will need more 'hardware' tuning like intakes, cams, porting, exhausts and so on. Don't expect miracles from seperate items. Mapping is best done after the hardware tuning has been done.