First Buy GT tokyo To genva
Second Complete game untill You get the unlockable 10,000,000 credit and all your licences.
third click on unlockable to transfer over to you gt3 save file.
Forth Start up gt3 and you will have 10,000,000 credits and the licences you have unlocked.
this might seem like a waste of money but the game is cheap and is preety fun
now buy the Escudo Pikes Peak this is a very fast car, now put turbo 4 on it and do the last endurance race.
the easyest way to do this is on the corners rub against the wall and you should just go flying around the corneer only losing a bit of speed.
You wont have to pit in and you have the choice of some very fast cars at the end