Cheat Codes

As far as I can tell, you have to beat the tournament -twice- before the codes are made available. Winning the tournament once just gives you the extra track (Lost Vegas). Once you've completed the 2nd tournament, a check of the credits will reveal these codes:

EAC POWR - makes the bonus car available.
EAC WARP - makes game play go faster.
EAC RALY - turns Rusty Springs into an Egyptian dirt track.

Yes, they have to be in all caps, and there must be a space between EAC and the code word - just like they're typed above. You type them in at the prompt for the player's name when starting a single race. It may also work in head-to-head and time trial - I haven't tried it there yet.

Cheat Edit

Choose Las Vegas, and be the 1st at each game or edit the save game under:
NFS\GAMEDATA\SAVEGAME
FIND relative sector 0000001
0304(0130) 5A 00 20 00 43 00 48 00 00 00 00 00 00 00 00 00
0320(0140) 00 00 00 00 00 00...........
change to
0340(0130) 5A 00 20 00 43 00 48 00 01 00 01 00 01 00 01 00
0320(0140) 01 00 01 00 ................
load the save game again, choose any game and play (can quit in the middle) then the hidden track will appear.