if you swap a small diameter butterfly for a larger one it can give you a great increase in bhp. my mate has an escort 1.6 and gained 9 bhp by doing this and it only cost £150 bargin.
I'd be careful though. What sort of escort was it?
Alot of the Bravo's use MAP (mass air pressure) injection systems and rely on the pressure drop through the inlet to calculate the airflow and hence the amount of fuel. If you change the throttle for a bigger one you get less pressure drop and the ECU will give less fuel which means less power.
If its a MAF system (mass air flow) which uses a flow meter then you might get some improvement. I'd try induction kit and exhaust first. The Fiat induction system is quite restrictive.
Got a haynes manual? They usually give good descriptions of the induction system.
I still think you will have probs, Fords generally have much more interchangability of parts between models that Fiat. Fiat never seem to use the same part twice on different models.
Thought so. Looks like you are stuck with the throttle on there unless you can find an ECU tuner that will reprogram yours for a larger throttle openning.