Well here's the scoup. I have an 87 GN that has been modified with a NOS system that was installed by NOS in CA several years ago. The injectors (6 of them) have been welded right into the plenum. Nice set up actually. However, I don't know much about the particulars of the system, that is why I need help. I have a boost controller in the car, but I never touch it. Running normal the car is set at a boost of 15psi and the same with the NOS flowing. What is the purpose of the boost controller? Secondly, I am going to start running on 100 octane gas. I'm not sure if I have a modified chip in the car. If I run the car at the higher octane with the NOS should I tune down the boost. If so, what is an acceptable PSI level for boost?