Allight, another update.
Just did some more testing on the parking lot. If you slowly raise the revs, it doesent knock untill 3k rpm, but if you stomp it from the idle, and release the gas somewhere around ~2.5k, it makes the knock on throtle release. You can only hear it for a brief moment but its there.
So over 3k and when you stomp it like they do in inspection, it knocks... So, this is injectors or ?