New for 2018, we’ve decided to up grade our FC RX-7 mufflers by only offering our larger 2.375″ OD Power Pulse Mufflers for use on either stock replacement or street-legal RB cat-back systems! Our legendary RB mufflers now feature high flow 2.375″ inlet tubes for optimal exhaust gas flow through each muffler. For more information visit the Exhaust – Cat-Back Systems menu.