To Change your music for a race just press view change when you are selecting an opponent. The area to see the name of your song will be on the bottom. Select No BGM to have no music at all.
Extra Points
To get extra 9000 points , win three battles in a row against a human(s) player. Note: This Only works in version 2.
Get Bunta's Subaru Impreza WRX Type R
When buying a car, scroll over to Subaru and press: down shift twice, up shift twice, down shift twice, up shift twice, then shift down then up then down then up. After that hold the brake down and press View Change and his car will be all ready at the stage 3 upgrade point.
Get Bunta's WRX Type R (For Version 3)
When getting a car, steer over to Subaru and press: up shift x6, down shift x2, brake, viewchange.
Toggle Challages doring a race
To toggle challanges during a race, just press View Change.