In name selection type in "allporsche"
Buy the used cars and fix them up. Put them back on the market and you will get more money than you would if you sold a new car. If you want even more money for the old cars, keep them until the next era and they will be worth $60,000.
Losing the police in "Factory Driver":
You will get various kinds of missions when playing "Factory Driver". Some of the missions involved getting Porsche cars to customers in time and without scratches. Use the following trick to avoid the police and other cars that may block you in a chase. When you driving and see the police keep the "horn" held until police lose you. This works most of the time.
Get your car a rally skin:
It works only with 996 turbo 00, Boxter 97, or the 911 Carrera RS. All you have to do is open the folder (need for speed.../game data/car data/) and change the file names of the cars. There are two types of cars each 996, 996 f, boxter, boxter f, and carrera rs. Now you have to rename them the ordinary 996 file to 996f and 996f to 996 and so on.