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1988 944 Turbo S Overboost

Engine

Vehicle Information: Model(924/944/968): 944 turbo s; Year: 1988; Body Type: Coupe; Total Mileage: 70 000 mm;

I have a catbypass installed on the car with stock chip and if I am in third gear at 3000 rpm and I put full trottle, I have overboost at approx. 5000 rpm.The boost climbs to 17 psi; what's the problem? Wastegate? Knock sensor? I tried a performance chip and the problem happens faster.

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