Thoughts on high compression turbo builds

I have never used the stuff and don’t like talking about stuff that I have heard from other people. I have researched it for my own vehicle and decided not to use it because there were too many questions that I had that were up in the air. I want to know exactly what will happen if I make a change to my car, and won’t make the change unless it’s been confirmed my multiple people and I have seen it in person.