Into the cat or bouncing down the road most likely lol. What I'm curious about is how they got like that in the first place. Doesn't look like there was much, if any contact with the turbine housing.. almost looks like particulate in the exhaust stream or maybe just from being heat cycled so many times?
Is there ever any worry that the compressor will get chewed up like that and you could end up with your motor inhaling metal? Or is it just usually the turbine side that gets messed up like the pic above?
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Vanes do not just go missing, you are inhaling some kind of particulate between you compressor housing and turbine housing. Look over your bottom charge tubes, intercoolers, intake mani, exhaust mani. Have you looked at your valves?
brilliant black 2001.5 s4 built bottom end stage 3+ on e85
Whats the compressor side look like? If there's a lot of play the turbine could hit the walls of the turbine housing and cause it to fracture like that. If you look at the fins they have a slight "curl" to them which would indicate they were hitting on something or something was stuck in the exhaust port and hanging down interfering with the turbine wheel.