yeah bacially you need a scoop like an impreza's or what my 1st GT4 had on my ST185ATA, it ventilated the TMIC with air rammed into the scoop, hence the reason it was air to air, my next GT4 was the carlos sainz edition which came with the same set up as all 205's and it came with a vent and not a scoop, its there to serve a purpose of venting warm air to atmosphere keeping engine bay temperatures lower, chance are you may have got it lucky and the car got itself into limp mode before any serious damage was done, i'd be going for either one of 3 options 1. get rid of the TMIC 2. fit a FMIC 3. fit a Chargecooler
ATA Scoop which you should have fitted (my mates car)
and his engine bay
the vent is there to force feed air onto TMIC as pic shows