Not a good plan to be pushing the car with a JB4 before its finished its factory set break-in. The factory software limits boost till just over 1200 miles & you are over riding the program.
I put my JB4 in at 1400 miles & have not had any issues @ 16.5 psi.
2013 135is Cab JB4/ISO - 2011 335is JB4/ISO/BMS Flash - 2009 V-Star
2009 Ford Expedition EL 4X4 - 2003 Xterra 4X4 - 1998 Ranger 4X4 - FF Cobra MK-IV work in progress