if you are around 200 to 220rwkw changing the to z32 wont add any power.
all that happens when you max the stock afm is that it wont increase on the load axis in more, which means it will horizontal run across (map sensor style). so it will still work, make power, go fast and so on. youll just have a few less load points.
a z32 gives you more resolution and more load points, it wont add a single killowatt.