seems to be a kit you can order. What are they like, quality wise?
Would you steer clear from an “owner fitted” kit on a car?!
I hadn’t heard of them: https://reventshop.com/
Based on Subaru TD04
There are plenty of owners who will be totally competent at fitting a Turbo, if I had knowledge of their skill/experience over a reasonable period of time it wouldn’t put me off. All depends on the price point and your attitude to risk.