They could modify them to look like police cars or ricers (or leave them as they are) and send them into a big highway pileup or send them over a cliff, using a launch (or two... hundred+++). That would be a great end for a car chase, even if it happened at random and/or had nothing to do with the plot. I'd pay to see something like that, no matter how bad the rest of the movie was. They've got nothing to lose on an opportunity like that.