Its too bad that they've ruined it. With those wheels, they won't be able to go over a pothole without worrying about breaking one, so curb jumping is out of the question (let alone any other serious off roading they might need to do). Combine that with the surely horrendous gas mileage (would need a huge tank to be able to stay on a chase long at all) and you've got a pointless vehicle. They would've been much better off with a sports car that would handily beat that in speed. They aren't going to be catching any Koenigseggs in it with a 155mph top speed. With how much they probably spent on that, they could've gotten 2 or 3 Z06 Vettes, which would be better at taking down a speeder than a single Hummer.
It is menacing though.