Huh? The car has PI on it, as I stated we wanted to control the PI, and LPFP. It would not control the fuel pump properly, we kept having issues. Terry suggested using a Hobbs Switch, and just letting the controller do the PI. As I said not a huge fan. It does work, it seems to work ok, but you really have no control. How would you have more control? You can no longer log PI events separately to watch IJPW, You can no longer tailor your RPM/Boost table for exactly where you do or do not want fuel. Basically all you can do is just set global settings for adding fuel, in the "fuel bias" column, then you hope it does what you want. We tuned another 535 with GC's and JB4, we had a hell of a time getting it right, it just wanted to go rich all the time. If you are hands off person, the JB4 controller is fine, but I prefer more control.