The little mate is an automotive engineer, worked for manufactures direct, worked for race teams, started out as a master tech for a couple of marques inc BMW, Audi and Saab (all have a long and strong history with turbo charging), helped design and build race cars and bikes and been around tuning, turbos and water/meth injection specifically including runing Richards systems since the mid 90's so have a 'limited knowledge' learned on road, track and dyno's lol!
Heres a couple quotes BMW on the M4 GTS:
allowing the turbocharged engine to operate with higher boost pressure and earlier spark timing. The result is increased power and torque
"provide the M4 GTS's engine with higher turbocharger boost pressure than that used by the standard M4"
Do your research and dynos and continue to have your own opinion, we will have ours.
