Since no one else has uploaded one for Heihachi yet.
"Adds the damn sound effect over Heihachi's Sorya during his EWGF"
Source: https://www.youtube.com/watch?v=re9cIXVPVhQ
Mod Preview: https://streamable.com/83x1ix
(for people that are new to mods)
Go to "Steam\steamapps\common\Tekken 8\Polaris\Content\Paks", add a new folder and name it Mods, here is where you place your Tekken 8 mods :^)
Have a nice day!