air intake

Hi im wondering about whats the line that goes from the top head of the engine and in too the airfilter box...because im trying to set up a New air intake and i dont know what to do with that line...
 
Which engine?

On the GA16DE, there are two hoses that connect to the stock air filter box.
The larger one is for crankcase ventilation and the smaller one comes from the EGR-BPT valve.

Both are needed for proper engine functionality.
 
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