Unlockable: Burger King Challenge
At the “Click to Start” screen, enter “burgerking” to unlock the Burger King Challenge.
Unlockable: Castrol Ford GT
At the “Click to Start” screen, enter “castrol” to unlock the Castrol Ford GT.

Hint: Bounty Increase
You can raise your bounty as much as you want and complete that part of
your milestones. First get in a pursuit and then find a ledge (ex. on
top of the buses at the bus station) go as closes to the end of the
buses away from the up ramp as possible without falling off and without a
cop following you up the ramp. Then sit there and watch the cops go
crazy. It's better if your heat is 2 or up as the lower level cops will
sometimes lose sight of you and you'll cool off. At higher levels though
the police will hover below you ramming into each other and everything
else. This destroys their vehicles which in turn raises you bounty and
length of your pursuit. You can sit there as long as you like but check
behind you periodically just to make sure one of them hasn't gotten
smart enough to come up the ramp. The highest I've gotten off one
pursuit is almost 6 million bounty.

Hint: Straight Drivin'
Engaging nitrous oxide shifts the weight of the car and in layman's
terms, your car will attempt to straighten out. Combined with
speedbreaker, it is possible to take on almost any turn without an
appreciable loss of speed.

Hint: Re-Random Pink Slip
After defeating a blacklist rival, you may opt to take the pink slip
from them. Since the contents of the pink slip is randomized, you should
make an effort to save the game before racing a rival -- reload the
game and restart the race if you get something you do not want.

Hint: Roll Over Spike Strips
When approaching any roadblock with a heat level greater than four, use the slow-motion effect to avoid spikes strips completely