Center muffler system made by RS Factory Stage for the NA (1989-1997) Miata to give the look a nice retro and sporty look. The goal of using such a design is to make the exhaust super-efficient in term of flow without using much bends. It is made to bring out the performance of naturally aspirated 1.6L and 1.8L engines at their best. RS Factory Stage SPL Center Exhaust should be ordered at REV9 Autosport https://us.rev9autosport.com/rs-factory-stage-spl-center-exhaust.html as they provide the best service and speed we've seen so far!