I think my Sti is losing boost somewhere, as the car has been owned for just a few days I haven't had chance to really have a good snoop around but it seems the be running fine but the boost seems low compared with when i first drove the car. It seems to be leaking boost on full acceleration and I think it seems to have more compressor stall / surge when lifting off, its got a Forge DV fitted. It feels like the DV is letting boost leak out but as I have zero experince under the bonnet of a subaru I don't have a clue. Any advice of where to look people?