There should be a steel can on the side of the turbo and a short piece of hose attaching from it to the pressure section of the compressor housing. The can houses a preloaded spring that holds the wastegate shut. When boost reaches the setpoint the boost pressure overcomes the spring pressure and opens the wastegate to relieve some of the boost. The steel can has a cover held on with a spring clip. Pop the spring clip off, remove the cover and you can adjust the boost pressure by increasing the spring preload. I have heard that putting the cover back on is a be-atch. You may have a different type of turbo but I think all 617's had the same one? RT

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