PORSCHE 991 GT3 Exhaust DECAT cell cat pipe setCapitalizing on a formidable heritage of race bred 911's. Upwards of 475 hp, and a 9000rpm redline, We wanted to make the exhaust scream like a racecar should! Applying our usual formula, F1 grade Inconel 625, tuned cross sections, and perfect X pipe geometry, we were able to craft an exhaust that not only has the perfect sound, but is lightweight, durable, and performs to the highest expectations.