Does it just depend on your cars needs or should the fuel pump be replaced first for higher dry shots? Right now I'm using the red nozzle for the vcn 1000. Something goes wrong when I try to use the green one though. Checking the timing this week. I think the mechanic was messing with it even after I explained to him once already about the importance of not advancing it. He didn't speak good english so I don't think he understood. I have an act clutch but I think it should be capable of handling the 50-75 shot right?