The stock exhaust on the majority of the cars out there is very restrictive and not very performance oriented. Weâre assuming that your goal is not to restrict exhaust and choke your car. Invidia has designed this 60mm catted front pipe for either your BRZ or FR-S. These are constructed from 304 Stainless Steel and are sure to not rust. The 200 cell cats will help you remain friendly to the environment while improving performance. They also include nice, large flanges to ensure a proper fit as well as a new gasket to make sure that exhaust gas stays where it's supposed to, inside the nonrestrictive exhaust.