Ok to get real good and fast money follow this guide.
Requirements:
House with garage
Police Car
Get a police click R3 (right anolog stick) then park it into your garage.
Walk away from your garage put in the cheat to make all cars blow up.
Then open the garage get back into the car till it says mission 2 then get out and type the cheat in again.
You keep getting money without having to chase the enemy.
Thanks,
Hunterguide