oggy666

Hi all, Might be a newbie question here but... I was checking my air filter to see if it needed replacing (First time on a legacy) and I noticed a random box attached to my air intake pipe and a boost sensor. I'm a bit confused as other pictures of engine bays seem to not have this box and also I have no turbo so the boost sensor doesn't make sense. Box is marked in red and the boost gauge in blue. The car is a 2.0 NA Legacy Saloon. Completely Stock! Any feedback would be appreciated :-)