The most rewarding upgrade to make to any Jeep exhaust system is probably replacing the Commander OEM cat back system. When you install this new system, you can hear the difference and feel the difference inside the car. If your exhaust has gotten a little louder in recent months, you may want to consider swapping out the Commander OEM muffler with a universal muffler from myhotjeep.com Another Commander exhaust system component is the catalytic converter which muffles the sound and also traps gases to reduce emotions. You an improve your miles per gallon and get a little more power from you engine when you replace your Commander 02 sensor which monitors the amount of oxygen that passes through your Jeep emission system. If you're looking for high quality parts from the best leaders in the game, like Borla and Magnaflow, look no further than myhotjeep.com!