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Re: SVO: "Turbo Creap" , Help

There is such a thing as boost creep.  If the wastegate hole isn't big
enough for the amount of air you're pumping through the motor, even when
the wastegate in fully open the boost will continue to increase past the
point that you've set your wastegate for until you let off the throttle.
There is no way for me to know whether you will actually experience this
problem or not.  You can either believe the guy and put on the external
wastegate (it should be much bigger than the internal one), or you can
try it without, and just watch your boost closely when you're at full
throttle and high RPM.  If it starts to rise above the boost you've set
it for, then you know that's the limit of your internal wastegate.