I'm probably wrong, but without the shaft, I'd imagine the exhaust gasses would travel through the turbo to the intake side and straight back into your engine. Maybe lowering emissions, maybe causing some problems?
And with the oil feed blocked, would it not cause a build up of pressure in the crank case? Blow by, piston ring wear, oil pump problems?
I don't know if it'd do those things, just what I'd imagine might happen
