Cruise bubble power-up:
Pause the game, then hold L + R and quickly press Y, X, Y, X, Y(2), X(2). If you
entered the code correctly, you will hear a sound.

Cruise Bubble has cruise control:
Pause the game, then hold L + R and quickly press X(4), Y(2), X(2), Y, X, Y(2).
If you entered the code correctly, you will hear a sound.

War costumes:
Enter BLUR as a code to unlock the War costumes at the Extras screen.

Seed costumes:
Enter MOVIE or URBAN as a code to unlock the corresponding Seed costumes
at the Extras screen.

Extra money:
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Grab your opponent and interrogate him until he drops a credit card or his
wallet. Then, execute him and choose to steal. He will either give you a
credit card or wallet, depending on what you got the first time. Normally
when you kill an enemy and steal from them, you will only get either a
wallet or a credit card, and never both.

Use a close range head shot to get $5,000 or more in credit cards or money,
jewelry, and armor depending whether you need it or not.

Hint: Restricted Area: Treasure chest
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Find the hanger with the UFO inside then go to one of the corners to
find a treasure chest with money.

Hint: Using a winch
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After buying a winch for your truck, you can use it by holding Black
then aiming into an anchor spot (for example, a rock or tree). Press
A to winch it in, press B to get slack, and press Black to detach the
line.