BMEP

i'm sorry, but i don't have time right now to give a full answer

but from your explanation, i still don't accept it all. despite that, we are both entitled to our own views and i hope that we should be able to keep discussing it in an adult manner

you seem to be contradiciting yourself slightly. you accept that there is uneven airflow between the 4 cylinders, but say that fitting a plenum spacer was not to help with that but just to increase the airflow.

if the airflow was increased by fitting the plenum spacer, why did it not need a remap? and how could it gain 16 bhp?