Trace the line from the air compressor (the one that doesn't go to the air dryer). On most, it goes to the intake manifold. Good idea. It gets air cleaned by the engine air filter, "compressed" by the turbo and cooled by the CAC! That is why few have a separate filter for the compressor.
It IS possible that the air compressor has a separate air filter, so please VERIFY. Not likely but possible. As I said, all you have to do is trace the inlet line from the air compressor and see where it leads!
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