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Sorry it is 3 psi and 4psi.. I was going off memory of my N54/N55 days.. I just went to the website for b48 motor and checked.
First of all did you actually get the Jb4 or the JB+?
If you got the JB4 then did you get a bluetooth connector, or did you get a USB cable? You would best use the software to at least see if your car will kick into safe mode (map 8) or.. I can show you how to custom a new map (map6) and it's pretty darned easy.. set it and forget it. There's a good chance that the 0.5psi might work fine on map 1 for your car, but my car didn't like it. Rememeber car has to be warm.. I think it was oil temp over 160.
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