right you obviously put gemballa GT 500 in google, well done, mine is not the 997, thats the newer car, very different to mine, mine is the 996 older car and has no driver aids, some say this is better but i think its down to personal taste.
the original GT 500 based on the 996 911 has no turbo, it is norminally aspirated the newer is 520bhp but with turbo so drive very differently as torque and power are delivered in very different ways.