[JFP in PA]

Originally Posted by Chuck W.

OK... this has nothing to do with Boxsters, but I have searched the web and can't find the answer. When I was have been at race tracks and watch the newer Porsche races cars on the track I hear a loud "bang" or "pop" sound when they shift while racing. What is this caused by? TIA

You are hear the clutch less transmissions shifting. The race cars use a setup different then the street version of the PDK, which has nothing to dampen driveline sounds during shifting, resulting in loud noises when shifting. If you watch the FIA rally cars, which also use racing clutch less transmissions, you will hear a similar sound when they shift.