The GT2, the pinnacle of the 997 range. the factory setup incorporates a titanium rear silencer section, so how could we improve on this? simply upgrading the material to formula one grade Inconel 625, the removal of the center chamber, addition of our trademark tight radius x pipe, and upgrading the catalyst section for 100cpsi HJS units, or decat sections for optimum performance. Here at Kline Innovation we believe in the absolute best materials for every application, chosen scientifically by the materials natural properties. Titanium/Inconel/Carbon fiber exhaust boutique, of course we also offer 304 stainless steel as an alternative on our complete range. Every material has its own unique properties, and perfect application based on weight, strength, heat resistance, and chemical stability. And of course we at Kline strive to craft some of the worlds best lightweight exhausts utilizing every innovation possible!