I can tell you with great authority because I have been testing the Comptech-modified injectors for Comptech itself for almost 8 months now that the Comptech injectors have plenty of capacity for the 3.3 inch pulley. I have yet to see more than 80-85% duty cycle max. My guess is that they are even good enough for the 3.1 inch pulley.Sskhimura said:Is it really okay to use the 550 injectors, that comptech prodvides on their website, for the 3.3 or 3.1 inch pullies, or do I have to get 650s? I'm asking becasue I did search all around, and it seems to me that the answer really isn't too clear. Some people are saying its okay to run those injectors provided by comptech for the comptech SC, and some people are saying that it will be just like the jackson racing SC and will require you to get 650 injectors if you want to run 3.3 or smaller pully. Any information regarding this will be greatly appreciated. Thanks in advance.