[rotrex]

Actually air distribution will be pretty uniform, too. Otherwise it won't pass emissions.
Dry manifolds, they only flow air, are usually pretty good and spread air within a few %.
Once you go forced induction, you need spend more time to get uniform airflow.

But for methanol water direct port injection, you don't have to bother with flow inequality.
Just install them close to the inlet port of the head, top side, straight section, behind the fuel injectors.