Well I bought them from the tuner and didn't realize until after the fact that they were challenging to work with. I figured buying injectors from a reputable vendor would have shielded me from these sort of incompatibilities. Oh well, I learned a lesson. I'm still hopeful that dw will look at them and say they found something when I send them back. My question is and maybe I jumped the gun pulling them. Do I need a hp & lp pump to run these higher flow injectors. My guy would say yes to achieve the specific flow rate you need more rail pressure. Idk, I'm kinda shocked these ran like they did. I did become very good at removing upper intake manifold lol.