I created the BEST TRACK EVER for this achievement !!! It gives you 5 minutes of total destrucion i did it for testing and killed 340+ cop cars and got 210.000 exp points in the same 5 minutes and if you dont have it yet you will get a lot more achievements just go to THE WORLD WORLD CITIES PRESS Y to search city THEN SEARCH CITY BY CREATOR AND WRITE crazydaan !! You will find my maps 1 is for cop cars and second one is for race cars achievement !! Have fun getting frags and xp boys