Hi guys,I am writing for my 159

practically this is the problem,if I accelerate gradually in the second(where you note the problem) when the car arrives almost at the peak by one shot,after which the pressure drops and then gets up again.in that moment, you hear a noise type hiss of air, a frrrrrrrr

I then often hear the same hiss durable that I thought it depended on the wind, but probably not,I also tried to decelerate,accelerate,put in neutral, etc.. but I can not realize why sometimes does and sometimes not.

I thought of a hole in some sleeve or in the intercooler, but it does not smoke and does not lose the prestazionio,there is only the one shot when it goes to peak the turbine

ideas!!