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I notice you don't mention the lifespan of the turbo seals.
You also don’t address the fact that the hotter the turbine side is, the hotter the compressor side will be…and the hotter the intake air will be.
Thermal expansion is NOT the biggest factor in creating energy in the turbo. FLOW is the biggest factor. If you disagree, try this:
Get a turbo on a bench and put on an intake pipe and a downpipe. Then heat the turbine with a torch to the point it glows red….and see if the turbine will even turn one time on its own. Flow is most important, not heat.
You will gain much more energy by worrying about keeping intake temps lower than you will by worrying about thermal expansion. And to keep intake temps low as possible, you need to keep the exhaust heat in the exhaust gasses…and send them through the pipes, out of the area.
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