On a cat back exhaust, the piping starts from the catalatic converter and runs all the way to the back of the car. On an axle back exhaust it starts from the rear axle and runs back. The pipe between the axle and the catalatic converter is called the mid pipe. And a muffler is just that. There is no piping and you have to get is welded on to the stock piping. Now when you put a cat back exhaust on your car, you are increasing the size of the pipe, which means you are allowing more air to be released form the engine which creates more horse power. Any other exhaust that you put on like and axle back or muffler is really just for sound and looks!
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