Himni Racing Additional Fuel Injector Weld Boss/Bung. Your choice of Mild steel or T6 billet aluminum. CNC Machined in the US to provide plenty of welding "meat" at the top & fits both Bosch/American O-ring (14mm) & Denso/Japaneses (11mm) fuel injectors. Slant cut angled lower outlet provides ideal injector flow pattern boss positioning to achieve optimum fuel atomization.