There are several good reasons why off-roading enthusiasts should upgrade their exhaust and intake systems. The first and most important one, of course, is that it adds power and therefore improves performance. It can also improve efficiency, which can save you money at the pump. But the number one reason why most Jeep Wrangler owners purchase Cat-Back systems is that they add an angry growl that gives their vehicles a little bit of attitude. That's right, they make noise! And because they take in more air than the standard intake valve, they also boost the acceleration and towing capacity of your Jeep Wrangler.