Yes I know that, I have Dyno tuned my turbo civic n later many stock RS turbo civic did dyno as well which showed less power than non RS civic turbo. Now all these civic rs has been tuned to 250+hp, many of those r my friends as well. Also I remember Honda has to change the ecu firmware in 2017-18 due to knock control, I felt instant less torque below 3k rpm on my civic turbo and the peak boost was not going over 14.5psi keep in mind it was 16+ psi back in 2016 from honda factory.