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Sure you're seeing aluminum dust? Is it non magnetic?
There is no aluminum in the hot side of the turbo, and no aluminum going backwards from it untill you get to the cylinder head exhaust ports, combustion chambers, and pistons.
The hot side housing of a 3K turbo is cast iron, the turbine shaft is steel, the 2 turbine shaft bearings are bronze, and the turbine wheel is a steel alloy.
I don't know what muffler you have but they are usually steel or stainless steel.
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