After installing my injection system (AEM) we put the car on the dyno and started at 8PSI and full blast at 20 PSI. We lost some HP so we started dialing it down until the power returned. We ended up starting to spray at 10 PSI and on full at 30 PSI, which is to say it never reached full blast. This was spraying before the throttle body. The boost increased about .5 PSI spraying through the supercharger. Next I moved the nozzle to the Y pipe. No noticeable change. After the header instal the car wanted more injected. We upped the meth content and set it to begin at 8PSI and full blast at 15 PSI and gained a few HP. I'm still running the same tune. Just my experiences and observations for what it's worth.

Les