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This is something I just learned recently too! I thought it was just to save the bay from excessive temps but it didn't make sense that youre causing so much more heat retention instead of shedding it off. But the reason I found was that its to keep the gases hot on purpose on the hotside of the turbo to keep the gases more expansive. More expansive = more power. But not on the cold end of course. Its why headers and uppipes are also ceramic coated.
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