The Agency Power performance header is made from 304 stainless steel and includes half inch thick flanges for your Scion FR-S and Subaru BRZ. The header has a special designed collector to give perfect flow for increased horsepower. The header can work with both the stock exhaust and aftermarket components. Installing the header will not only give you a gain in horsepower, it will also change the tone of your Boxer engine to a deeper and more aggressive sound. Header to over pipe gasket supplied.