4 or 5 boost
I have had the BMS stage 1 almost purchasing the vehicle 90 days ago. I too have had no codes, I bought the cable to increase the boost. I did so to 5 PSI and the care did not file as strong as the 2.75 standard rate. It was a very hot humid day which makes a tremendous difference with a turbo vehicle.
One caveat-I have the tuner box tugged under some wires near the firewall. when I pulled it out to increase the boost the casing had signs of previous melting. I bought some high temp silicone rap to insulate.
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