For those who dont want to download a file to get ALL the cars & tracks do as follow;
Create an empty file named "TG2001.DYN" in your GTL installation direction.
Any new profiles created in-game thereafter will have all tracks and cars unlocked from the start.
Just to explain ("create an empty file" means make a notepad file and rename it to TG2001.DYN) just incase anyone was confused.
When i 1st read this i was sceptical, but it works! wohooo, dont think it gives you money tho, but you dont need it i guess.