ARMYTRIX have created an titanium valvetronic exhaust system for the 2010-13 Audi R8 GT Coupe and Spyder that makes one insane noise! Check out ARMYTRIX now: br The titanium valvetronic exhaust system comes complete with wireless valve control with 3 modes (ON, OFF, AUTO), and even in auto the user can control the rpm at which the valve will open.