Super Speed mode:
Complete championship mode once. The game will remove mirrors in the
cockpit view and twenty cars to increase the frame rate to 60 fps.
Bonus pace cars:
Complete championship mode four times to unlock the Acura NSX, BMW M3,
Toyota Celica, and Toyota T100 pace cars.
Bonus camera angle:
Complete championship mode once and finish in first place in each race
to unlock a far top view camera angle that resembles the game Micro
Machines.
Drive as S. Hattori:
Complete championship mode once to unlock a bonus Japanese driver that
is not ranked in the CART-Season or with a Team.
Rainy weather:
Hold L + R + Down at the transmission selection screen in arcade mode.
Continue to hold the buttons until the track completes loading.
Weather never changes:
Hold L + R + Up at the transmission selection screen in arcade mode.
Continue to hold the buttons until the track completes loading.
Sites: