Its Tokyo Extreme Racers on PSP.
Other then that its just fun, you start out but buying a cheap car and joining a racing crew. As your progress in the game you and your crew battle for control or territories.
And thats the basics, you race, tune up your car, challenge other racing teams...
too bad there is no VS mode, it would be really fun to connect your your friends psp and race against his/her cars.
but aside from that the game is just really fun once.