You typically don't see the manufacturer ever offer anything that removes/replaces a catalytic converter. Actually I think it is illegal. Cars are emmission tested and certified before ever being sold. Even the BMW "Performance Exhaust" is really only a catback or axle-back. It keeps all stock catalytic converters in place. Which brings up another issue of how companies throw around the phrase "exhaust system" yet all they change is a muffler and tips.