Aero airbox query

Ive just purchased a old 9-3 aero , it sounds like it's had a dump valve fitted ( which I don't want ) but I'm not sure where to look.

Whereabouts am i looking to see if its got a dump valve?

It does not have an open dump valve as its an air-mass system.
If there was air loss it would stall all the time.

Yes that hot air-intake needs to go. Loosing 4 to 5bhp there easy.