Cheap Shots and More Easy Money
You can quickly get some more cash by busting open pay phones and parking meters... You don't get too much, but if you can do a lot of them you'll build up a healthly load of cash.

Easy Killer
When your rage meter is full, press L1 + L2 + R1 + R2 and you should be faster and stronger.

Easy Money
Head on over to Bringley Hill, enter one of the stores and start a robbery. Don't kill anyone, just punch them a bit, try not to allow them to scream for help. Collect $1,000, and take your loot to the robbery car. If you have three stars or more, go to the Outlaws crib. Enter it, then go out and you'll have no stars.

Strong
O x o x r1 l1

Lower wanted
Left right left right R1 L1 R2 L1 o

Boom cars
R1 R2 L1 R2 L1 left right left right

NO DEATH
R1,R2,L1,L2,X,X,X

Gang wars
C++

Infinite health
X,o,x,o,R1,L1,

Money 999999
Money in bank