J/X Head exhaust flow?

I saw that UT video. I disagree with UT that the upward location of the exh port makes it flow well.
Pontiac heads have a relatively long exh port because the head is wide & the chamber is biased to the intake side. The exh port also has a 135* bend in it that forces the port to curve down, which ignorant people, stupidly, claim that it hurts flow. [ Using THAT logic, how well would upward facing SBC, SBM, BBM exh ports, fare with headers that have a 90* bend. Gas almost makes a U turn! ].
I have done some amateur porting on Pontiac factory heads & got as much as 200 cfm @ 0.500". A stock Edel exh port flowed 184 @ 0.500".