Hello guys

So I bought a car recently and its got a few bits and pieces that I'm not sure about. Its a 95 impreza sportswagon with an ej20g swap

Pics attached.
There is a blue box with a lid and 2 hoses coming from it. Its where the battery use to be (battery moved to boot)
One hose connects to the intake and the other connects to the block. Inside the box there is absolutely nothing.
It doesn't seem to do anything there's no branding on it or any part numbers.

And last thing I have a denso 3 port boost solenoid mounted wiring connected but no other hoses are connected I think the old owner had prepared to use it but decided to wait is it ok to leave it there? Should I disconnect the wires its just hanging there in my engine bay by the 1 screw

Any help is appreciated thanks

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