Hey Mr Sly, i have the same problem as you at the moment, by boost laggs, but only every now and then, and im only running stock 7psi as well, with a stock ecu at the moment, any one have any idea on this one? r33 series 2 1996, it lags some times on winding up and other times around 5psi, and you can feel the pull then it kicks in, then it pulls then kicks in, its annoying the hell outa me as well, anyone think this a spark plug issue? (i havent checked them yet as been busy, but its the first thing im going to check tomorrow) just got the car back and this happened