I think it is a matter of risk management whether you remove the exhaust elbow and look inside the turbo for corrosion or not as part of a pre-purchase survey.
On my Mainship Pilot 34 which came from the factory with 8" of water line clearance and a non self draining injection elbow, I now know to definitely do it before purchasing. But after I added 8" of riser and pointed the injection elbow down to be self draining, I don't think I would do it every year or even before purchase. It is a very safe exhaust system now.
David
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