The Titanium-tip Limited Edition Gentle Exhaust made by Fujimura-Auto is made for the ND (2016+) Miata and is a bolt-on modification. It is more than 50% less heavy than OEM (only weights 3.3KG versus 9.3KG!). The piping diameter is 60mm and the tail is 80mm. Fujimura Special Edition Exhaust should be ordered at REV9 Autosport https://us.rev9autosport.com/fujimura-special-edition-exhaust.html as they provide the best service and speed we've seen so far!