Does anyone know? A friend is trying to get his direct port NOS working and its like detonating or something, almost feels like its hitting the rev limit, but its not. But he has so many other things done its difficult to tell... he also has injectors, fuel rail, headers and the NOS is setup for a 125 shot, he is using the 18 and 24 jets for fuel and NOS, respectfully. Any ideas? Please help