It is a very fun car game, and very good, but the best is only a matter of opinion.
Yes
all of them
The Carson extreme hot rod, with a speed of 8/10
Try the Burnout series.
you stop your car and wait
No. But you can paint the cars that are in the junkyard.
Play until you Win
drive through a garage.
I think it makes the car stronger.
Burnout Paridise has more realistic car damage, and the race types are really well planned. You can idmediatly go into driving once you start the game. Need for Speed Undercover has more feacures and modes online. It has a greater variaty of cars, and you can do missions. The better game depends on your taste in what you want. If you like destruction and high end fun, go with Paridise. If you want to humilate your friends, and have more ways to earn cash, go with Undercover.
I think PGR 3,Forza Motorsort 2,Grid,Burnout Paradise,Burnout Revenge,NFS Carbon,and many more.
The only possible way is through hacking.