The Bisimoto Pulse chamber system is now available for your Porsche 911 (991.1) from 2011 to 2015, non-turbo models. 14+hp, with a nice, deep, race inspired tone, and 32 pounds in weight savings. Stainless steel construction, and hand made, prototypes used for testing, and fitment. Typically comes with welds that are not aesthetic in nature, but functional and strong.
No drone, and retains the factory tips for that stealth, OEM look. Come in a paired set, and requires bumper removal for installation.