500 cars
1300
There are about 400 cars in forza but you can get a extra 90 by dlc
yes of course
i think so
yes
To sell cars in forza horizon one must first have a properly register account. One must then enter as many details about the cars they are trying to sell as possible.
Forza Motorsport in my opinion is just a little bit better then GT 4. The physics is both games are very good with GT 4 being just slightly better. Though GT 4 does not have very many customization options unlike Forza, but Forza has no open wheeled cars. Overall both games are very fun. If you have an Xbox 360 buy Forza, but if you have a PS3 get GT 4, or even better get both if you have both systems.
A legit answer is unable to confirm yet. BUT, I am 98% sure you WILL be able to tune, repair, and customize cars on it.
Forza 4 can be displayed at 1080p.
You can't
Forza Motorsport 4 will be coming out on the fall of 2011.