The thing is... experience does not equal proof. Neither does basing a design on sound engineering principles constitute proof.
At best this is evidence.
It may be that someone has a lot of experience tuning a type of motor, and they may then be able to say that - all other things being equal - that header primary size A is better than size B.
A real lot of experience may then entitle someone to claim expertise.
They may then reasonably argue that they anticipate no comparative difference with the results when the combinations are moved to a Cobra. (And certainly the contribution is valuable and I'd like to see it continued)
However, until the results are tested in a Cobra - its still opinion. Perhaps even expert opinion (which will carry a lot of weight)
Proof would come with the hard data (say dyno graphs) from the same engine with the different header sizes in the application in question.
I think that if you're claiming that what you're saying is not opinion and asking someone else for proof then I think its reasonable to expect that Your proof be provided.
So I'm seeing a lot of 'talk' and not much data - That basically was my point.
The other interesting notion this thread has raised is the question of being up one's self
. I haven't heard that phrase in a long time and it made me laugh - its not really a way in which I'd generally view someone but perhaps it could be instructive.
I guess the assessment is (again) a matter of opinion. If I were weighing up someone in that manner - in the context of their posts in this forum - I guess I would have to look at the level of vitriol, the respect they show others' opinions, their capacity to support their arguments in a cogent manner and the degree of circumspection and qualification they add to their opinion.
Hmmm......might be better for me if I don't apply that test to close to home
LoBelly