Ok cause there is a diffrents between the 2.0L wrx one and a 2.5L sti one cause of the diffrent throttle body positions and the throttle body on the sti is larger so the hose has a bit more of a curve and is a little longer then the wrx one
It would have been left over from when I did the the sti intercooler on my xt and then swapped to an aftermarket one when I swapped the intake manifold.