Tanabe Medallion Concept G Single Exit Cat-Back FRS/BRZ/86CONCEPT G is an all new motorsports developed exhaust system that features high power benefits, while maintaining responsible sound levels. Using the all new 'continuous strand' ADVANTEX packing material technology, CONCEPT G acheives extremely high levels of exhaust system efficiency, while maintaining a street driveable, extremely clean sound output that is under 93db. This system requires no removeable silencer for under 93db operation at all rpms,