Hi I have Razors kit and currently have just one nozzle installed on my car. It runs fine and and I have the controller set to 7 to 8. With a/f ratio on xfi set at 10.8, Did not know if it would be overkill for my car for the 2nd nozzle. I usally run around 17psi on the street and around 21 at track when I go which is not much. I all ready have the 2nd nozzle that I bought from him some time ago but have not installed. Combo is below. Thanks for any advice!!