no stock boost is 6psi low and 9psi high but you wont hit fuel cut till 12psi meaning the ecu can fuel upto 12psi without running lean. 6psi = 0.41 bar 9psi = 0.62 bar but you will only get the 133bhp on high boost (0.6bar) so still a good result on just a small amount of boost at this level if you up'd the boost to 0.6bar you will prob see and feel the 15bhp gain