kya!

[trillium]

I was always told that I didn't kiai loud enough- especially the first few years of my training.

I recently went back after a few years absence from "class" training (trained on my own during that time) and boy did it feel good when I kiai'd for the first time back....

[italian_guy]

During kata execution I kiai quite loudly because is part of execution itself, during sparring I do not kiai at JKD I just exale with a soft huh sound while at karate sometimes I do kiai... depends if it comes out naturally or not.

[shogeri]

I make a small exhale when striking, but not the loud KiYa...Similar to what other's have said they do.

[DN]

or some realy screem the word "kiai",

That’s like dropping a brick on your foot an yelling 'SHOUT'

there are reasons to control your breathing when doing a particular action but

they don't require you to be super loud.