I am considering to include this nifty option in my 997C2S order but am rather discouraged by my dealer. They claimed that the TPMS system is very sensitive to pressure changes (which I thought was a virtue) but it kept throwing error messages when the car is taken on long highway drives and track driving. Is it true that the ideal pressures are preset at the factory and it cannot be tailored/fine tuned to our specific climate conditions in different countries/seasons? Can we preset the low pressure warning parameters? Hope someone can shed some experience here. Thanks in advance.