I e-mailed this exact question to Racelogic several months ago and they said I should be fine. I said it was a wet NOS system, and they acknowledged that there would be extra fuel getting into the cylinders but it shouldn't be a problem. They said it might ignite in the exhaust system, but if I didn't have cats to worry about I'd probably just suffer from the "Wolf effect" ;) I agree with you, though, Bernie, I didn't feel comfortable with the idea of extra fuel getting in that the system can't control.