I have an RCM open neck twinscroll downpipe to fit to my Spec C but i have noticed there is another threaded boss near the flange where it bolts to the centre section.Does anyone know what this is for as obviously i need to plug it with something.Is it safe to just blank it off or is it there for a reason,i dont want to blank it off with a spark plug if i can help it for fear of being tempted to wire it up
all help gratefully received