Akrapovic Link pipe set (200 cpsi cats, Titanium) for Porsche 911 Turbo/Turbo S (997.2)Akrapovic Link pipe set (200 cpsi cats, Titanium) for Porsche 911 Turbo Turbo S (997. 2) The next option is to replace the stock link pipes with the Akrapovi variant made from titanium and incorporating 200 cpsi high flow catalysts. These link pipes, when coupled with our titanium center muffler, produce a total weight savings of 8 kg compared with the stock system. When installing Akrapovi aftermarket optional down pipes with sports catalytic