Changing the effect of the Shrines

[Komdu]

In the original civ, all the shrines give a boost to finances in cities with the religion. I would like to change that for some of the shires to science or production. However, I am unable to find the correct bits of the xml in the building infos file. Where can I find those modifiers? I know it is possible because the FfH people did it with their ashen veil shrine. However, I can't find what they changed.

I have BTS

Please help