[JHOOPS2]

To be basic, it is my understanding that the piggyback sees the boost that is being ran and makes the DME think it is seeing less boost so that it will then add more boost until the JB4 hits it's target. This is why if the JB4 map 2 commands 14.5 psi peak, then that is what you will get unless their is something wrong with your car. It isn't adding 5.5 psi. It is simply telling the DME that it is only making 3.5 psi, therefor the DME adjusts the WG to the point that the DME finally sees 9 psi, but in reality the turbos are pushing 14.5 psi. In a very small nutshell.