I’ve tried searching, I’m new to the forums, but not to cars. I recently upgraded my fuel system, bottom end, turbo, and head components. I decided to go with a built bottom end (forged pistons, rods, and css), upgraded valve train GSC S2 cams and beehive springs/retainers, MHI 18k turbo, Walbro 450 pump, and ID 1300 injectors. When removing my old ID 1000 injectors and installing the new 1300’s, I noticed the length was different unless the black adapters were installed. Do these adapters not impede the spray pattern of the injectors? I haven’t read/seen any information pertaining to these adapters, but it just seemed odd to me. Does anyone have any experience with these injectors?