I installed the JB4 today. Supposedly the rainbow pair goes to the boost sensor on the charge pipe and the pair with the brown wires goes to the MAP sensor on the intake manifold. The set of wires with connector that goes to the OBD port are self explanatory. The fuel wires provided are 2 black wires 1 short and 1 long. 4 cylinder uses the long one and the six uses long and short i believe. On an email and write ups it says to connect the long one to the signal wire/white wire on the AFR sensor which they sell a pigtail and said it is the #2 wire but looks like the #6 on the harness as they are all numbered on it. This will be crucial I think because I also purchased the WMI kit. So I will update when I get some more info but for now it's into the white wire anyway.Could the connectors (brown leads and rainbow leads) go to either map sensor? When I reinstalled the jb4, I put the rainbow leads to the manifold. Went for a ride and my car felt somewhat faster than before.
I checked my loggs and I had a peak boost of 26psi. I switched the leads and my car runs as good but I hadn't had the chance to get another logg.
Prior reinstalling, I had a peak boost of 24. Maybe it's due to the fact that my ecu is relearning since I reset it?