I have been emailing back and forth with Don M regarding some injectors for my truck and was told that there Flux injectors were specifically designed for the TST CR box plus they are only 40hp, I am not doubting him in any way but I was also thinking about getting Diesel Dynamics 100hp injectors and now I have this big question mark in my mind about certain injectors being ideal with certain boxes. Can any of you guy's educate me a little about this and tell me what you think. Thanks, Mike