Trying to get more then 4 stars on GTA3!!!

[WnD]

Hey guys and girls, im gettin really peed off here coz me and my bro have been playing GTA3 since it came out and theres not a single day that we got over 4 stars (u know where the coppers come after u)

I have even use the cheat for some action but still 4 freakin stars.
I mean i blow every shit up i saw moving but still 4 stars.
We killed civilians, police officers, we blow the cars, buses,trucks ,even shot a rocket at helicopter and shot it down.

so if anyone knows how to get more stars up then just four
it would be very helpful