These Front Pipes are composed of steel and made as a direct replacement of the OEM Front Pipe. Being mandrel bent and with an increased diameter of 80mm the item will help increase turbine response and extract extra power from your turbocharged engine. Specifically designed and manufactured for circuit racing this TR Front Pipe will give you an instant horsepower increase. When installing on an FD3S RX-7 you are required to modify the factory computer setup due to the increase of boost.