Enter XYZZY during any race to enable cheats. Then enter the following:

yes,occifer - kill cop
bribe - kills the cop.
k'thunk! - gives you the bat.
spoon! - gives you nitro
thwack! - gives you the chain
plugh - disable cheats

Great Start:
In options menu type 15S9 PUO3. You will get the $200,000 bike and start at the 1st level.

Martin S., Stephen Gaddis, Jeremy Leong, and Syanide Death