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Performing an engine swap, pulled the engine, found a box which looks like a breather inside the drivers wing. It has 1 pipe going to the filler neck and the other going to the back of the engine. Is it needed? or can I replace it with something a little nicer?
 

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It's the fuel evaporation storage system
 

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Keep it, do not remove it.
The ECU will throw codes without it.
 
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