Nikco

Seems to me that there is some valves opening and closing when driving.

lets say I do a pull up to fifth gear and release the gas,
i clearly hear a weird sound like a valve opening and brings the exhaust sound higher and if I give it more gas or just try to boost it, the sound is intense and past 4500rpm the boost won't exceed over 0,5bar at the gauge.

i had the same problem some time ago with the stock ECU, not sure how I solved it but I checked every hose and vacuum line and fixated them properly.

and after the pfc install it's here again.

any hints to what it could be?

arghx

iTrader: (3)

did you replace your check valves?

sounds like you are hearing the sound of the turbo control valve opening and closing.