The Tubi Style Exhaust System for the Cayman and Boxster replaces the entire factory exhaust from the header back, including the connecting pipes. Unlike the facory exhaust, this system's connecting pipes are mandrel bent and do not include any sections that restrict exhaust flow. Together with the free-flowing muffler technology, the connecting pipes and secondary resonators not only help produce the best exhaust note available for the 987, but they also contribute to the 15-20 horsepower gains that can be realized by using the system.