Cheats

APHRODITE-very fast mode
CHMPA-all championship modes
MRTRK-all tracks+bonus track
TACARTBCARTCARTDAR-gain all of the bonus cars

Go to the arcade mode and press:
TACAR
TBCAR
TCCAR
TDCAR

Next, press Enter and then Escape. You will get not only all the tracks but also the hidden ones. This cheat must be applied for all modes.