lately ive been closely watching my boost controller with the boost pressure readout, its been showing the turbo reaching just over 1 bar but lately it has been hittin this figure then slowly dropping (exhaust leak or blow off leak id first assume) then today on the way home it wasnt even reading above 1 bar, and ive slowly been noticing a lack in performance...am i looking at a turbo replacement or are there other things i might have to be looking for?