I just have some questions about the turbos in my 04 XC90 T6 2.9. I just wanted to know more about how they perform and when the turbos kick in. If there is a site perhaps with more info that's great. The main issue I wanted to know about is that while I'm accelerating it will kick down from 1st to 2nd, and then all of a sudden there is a massive boost in the turbos. I was trying to see if this was normal or not. I hoped that learning more about how the turbos function, and perhaps knowing more about the system, would allow me better understanding. Thanks.