Piston Slap: A Turbocharged "Placenta Previa"?

Daniel writes:

Hi Sajeev,

I’m a long time reader, first time writer. I have a question which no one seems to know the answer to so I figure you and the B&B can have a go at it. I have a good condition spare turbo laying around from my MR2 turbo before I upgraded. I want to install this into my toyota previa. The problem is the area where the turbo will sit it will be exposed to the elements under the car ( rain, snow, salt) the way the exhaust manifold sits I have no choice. What sort of problems do you think I have in the future with the turbo being exposed like that? I’m in Chicago and this will be driven in winter. And the van is lowered too so the turbo will be pretty close to the ground.

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