You cant buy Formula One cars. You can only win them.
the GT-One, The Formula GT and the suzuki escudo
buy gameshark
Not all the cars can have nitro but for those who can, you just have to buy the nitro parts.
Yes, buy a fully customizable transmission, and set the speed to whatever you want it to be.
I dont think you can...
No
You cannot buy cars on GTA IV (or Episodes From Liberty City). You just have to steal them - even from car and bike showrooms.
If your talking about the Veyron and Gran Turismo 5 you don't buy it but win it. The championship you win it in is the Gran Turismo World Cup.
Gran turismo is so much better they have been out longer than forza, forza have just tried to copy and make better and failed. Gt5 has so much more car makes and cars in general. Forza is more of a street racing game, dragging, as soon as I hear that need for speed comes to mind. Body kits, need for speed again. Gran tursimo is just strictly racing and made for speed and gran turismo has so many faster cars. Gran tursimo even has a car named after them, masarati gran turismo, sounds good, imagine masarati forza, doesn't sound appeling. I can go on and on but that will do. Gran tursimo is better, better cars and graphics. Gran turismo is the game for motorsport cars not street cars. Buy need need for speed instead of forza I would rather.
the only way i currently know is by using the driver levels. the more you play and win your # goes up, allowing you to buy better cars.. IE level 40 you get any car you got the cash for..
go and buy it....
if you choose an event and select typical opponants you can see a list of cars, pick your favoured car and then buy it.