17-APG do you have a so-called "ämal" valve? This is an electrically controlled brown valve normally placed on the right hand side of the intercooler. It has 3 connections for air hoses and an electrical connection. Disconnect the electrics. Now your engine should run with low boost and should not reach the boost limit. Just try it on the road and see if the engine cuts out. You should feel a substantial loss of power, but this is normal, because the boost is a lot lower now.