Enter the following as Passwords:

WLLVDDAll codes enabled
GGWWOOAll cars & cups
NRNNRRCheetah car
TRTTLLCobra car
PXPRTSMaster mode and bonus cars
YMSTTRPanther car
SDSSRTScorpion car
LGSSSXCrystal cup
CRKKYYDiamond cup
DZPKKKZenith cup

Hints

Helpful:
On Canyon just after the start go to the far right, there should be a gap in the
wall go through it. It should get you first place. At the first corner go to the
far left there is a road leading down, follow it and it should bring you out in
front by heaps. On Island just after the 180degree turn go into the first opening
it is a lot quicker than the other 3.

Thanks to Revolution readers Nick Barker, James and Mister Mistereeus!