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It's not any different to my knowledge. Sport Chrono will make a difference to PDK. But, for example, a 2011 Carrera S and a 2011 Carrera GTS will have the same PDK hardware and same PDK performance, assuming both cars have Sport Chrono. It is possible that the two different cars would have different Porsche software (since there was an update that folks have said impacted PDK performance).. so a 2011 Carrera S without the update and a 2011 Carrera GTS with the update might have a different PDK performance. But that difference would change once they were on the same software release
RWD, wide body, manual transmission, great options unique to the GTS and purpose built by Porsche with few examples makes it a pleasure and gives a drivers response I just keep being amazed by.
For anyone looking for these cars, you're on the right track. When you find your car, enjoy it and never sell it! You'll be rewarded, their just great.