VIRTUALLY VIRTUAL -- VR style graphics 
SWAP SHOP -- Background music and new sound effects 
LITTLE WHEELZ -- Over-inflated tires 
PI MAN -- Wipeout mode 
ZOOM LENSE -- Helicopter viewpoint 
BOX CHATTER -- Murray and Martin sprite commentators 
BILLY BONUS -- Four extra tracks 
CATS DOGS -- Rain frogs instead of water 
OEAN ALESI -- Round 16 in Championship 
TOO EASY -- Grants first place on all tracks in arcade mode allowing access to extra track.

Gameshark codes

Infinite Time 800b34400c60
Select Button For Turbo d00bcea80001  800c6f507000