The RUF muffler kit for your Porsche 996 Turbo is actually an extensive modification performed to your original Porsche factory muffler system. The entire exhaust system is disassembled and rebuilt to exacting specifications laid out by RUF. Modifications to the catalysts, muffler baffles, as well as the exhaust outlet finishers. The net result of these modifications is increased flow, with a performance increase of 10-15hp immediately noticeable. The most important part about this modification the fact that RUF spent countless ours fine tuning the placement of the baffles in the exhaust system to confirm via dyno testing that the exhaust system performed according to requirements, without an noticeable increase in drone.