the last few days my car has been over boosting and cutting out if you put your foot down in 5th gear . no problems in the first 4 just 5th it boost over to 1.5 when the other gears are 1.2 . its been using a lot of fuel as well lately . . what could it be ????? the cars a wrx wagon , standard ecu , td04 , apexi air filter , dump valve , larger top mount intercooler and a boost tap , full de-cat , blitz b/b ...

 

Look for loose vacuum hoses.........