I'm about to install a set of Injector Dynamics 1000cc injectors in my B18C. I noticed that the ID injectors comes with a o-ring at the bottom that the stock injectors don't have (see image). As far as I can see this o-ring serves no function and shouldn't be there? Should I remove it?

 

I personally left them on mine.

 

leave them on

 

Left mine on as well, no issues.