Fitment Information Mazda 3 Hatchback (2014, 2015, 2016, 2017, 2018) Specs & Features 2.5" Catback Exhaust Race car aggressive exhaust note Stainless steel piping and muffler Direct replacement Rev9 exhaust systems deliver the most possible power from their minimal bends design.  Each exhaust is designed to have the smoothest possible exhaust flow to give you the least possible exhaust restriction, the most power, and the best sound. Rev9 exhausts are designed to have the best fitment and unless stated otherwise, are a direct bolt on replacement for your factory exhaust system.  Mandrel bent piping and TIG welded joints offer the best performance while being long lasting.