Phil, if you could just answer the question as to why BD10s (which lose you bottom end torque) and bigger ports (which lose you bottom end torque) are NOT a compromise, but that a 2psi cap on boost for 1000rpm of the rev range IS a compromimse, that would be great, cause at the moment you are saying one is a compromise and one isnt, and I cant understand your thinking for that?
Why is getting rid of surge by putting in a bigger cam somehow more acceptable than getting rid of surge by altering the boost map slightly?
As for your comment that "an engine doesnt have to be a compromise" can you name one that isnt? cause I can think of NO engine in existance that isnt a compromise in multiple ways.