hi i have a subaru legacy 2.0 twin turbo but have a prob it went up to the mecanic today as the second stage of the turbo didnt seem to work , he hasnt managed to cure the prob and we cant seem to find out much about them being an import he says it may be something to do with the vacum as the turbo itself seems to be ok the turbo kicks in then seems to die back again and he said there is a box to the left hand side of the engine with loads of pipes and 2 solanoids . can anyone help as we are a bit stick