I'm not sure if it is different with a turbo but I believe the ESS TS3 kit uses the OEM kit which is 14-15psi.
Originally Posted by GTUnit
Plastic manifold may not be strong enough to hold the boost (most likely not)
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red