The best strategy to combat criminals driving sport cars is to ride along with other cops so they can try and pop the tires of the fleeing car. If cops were not allowed to use their personal vehicles to pursue criminals, then I would agree with having the LEO division. However, this isn't the case as cops also use high end sport vehicles to pursue criminals like myself. Also being able to freely spawn high end sport pursue cars (infernus, turismo, bullet, etc) seems a bit OP in my opinion. This is because if the pursue car is too damaged or low on fuel, a cop can easily spawn a brand new one while a criminal has no such luxury.