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i have a 95 m reg wrx sports wagon, its has remapped ecu, hks induction kit, dump vavle ect etc. normally the boost runs at 1.3/1.4 bar but recently has been struggling to make 0.5 bar, then a mile later back at 1.4 then just as quick back 0.5. can any help? have changed boost solenoids but no change.