You are right, they took more than 1 approach to use the strato technology, but currently they advertise the 2Mix as being the way to go. As previous stated i’m still skeptical about it and i want to see if it’s gonna be succesfully implemented on bigger, meaner, powerful productsIt says stratified layer of gasses essentially in the text. The picture/ 10 second animation shows the kind of engine with the long transfer tunnels. Other ways of getting a stratified exhaust/air/mix probably count too as long as it is a Stihl but I am left to assume that.