I read an interesting thing on a turbo forum that got me thinking.
This would likely apply to any compressor.
A member posted that the CFM airflow coming out of the turbo is always less that what goes in, and that at one bar (14.5 # boost pressure) there is half the CFM coming out than what went in because it has been compressed.
Makes sense to me,
I've been thinking about this backwards all this time.
To me that throws a new slant on any trying to optimise with large diameter tubing, throttle bodies, porting, big cams, etc.
I've been downsizing on my cam specs for the last three consecutive years and am down to a .630 lift and 255 duration at .050
I haven't noticed any performance decrease or loss of WOT rpm at all and that explains it.