Move or Copy and Paste:
"AmbientPoliceChaseByWantedLevel.dll",
"AmbientPoliceChaseWantedLvlone.ini",
"AmbientPoliceChaseWantedLvltwo.ini",
"AmbientPoliceChaseWantedLvlthree.ini",
"AmbientPoliceChaseWantedLvlfour.ini" and
"AmbientPoliceChaseWantedLvlfive.ini".

You can now change the cop cars, suspects' car, and their weapons in each wanted level
on each specific ini file.