Congrats on your Carrera! It sounds like a VERY nice original example! With only 93K miles, it's still a "baby"!
I agree with the others here..........if you want a Turbo look car, sell yours and go out and buy one. Converting your Carrera (which sounds in such nice condition) would definitely depreciate the value and will "ruin" it so to speak. It's worth more in the original condition.
If you want to get into a conversion project, I would suggest picking up a rough or non-original car to do something like this to. However, as another member mentioned above.......it is YOUR car and you can do whatever you want to do to it!
Just make sure YOU are happy and enjoy your car in the end!