Injector

Which injector do i need to use to inject GTA5 dll's? ofc the best one xD

Any, it doesn't matter really. I personally use Xenos injector, it's easy to use and has a lot of scrambling features. You always could program your own if you really want to, it's not too difficult so you should be able to do it

There are multiple public ones that currently work very good,
Extreme Injector, Xenos Injector etc etc.