Exhaust Flow: Volume verses Velocity

[FC Zach]

I had a very experienced builder/ racer tell me he leaves the exhaust ports stock (just cleans them up a little) and then explained to me why he did it this way. He used a water hose as an example. A water hose without an attachment (ported exhaust) flows a lot of water but at a slower rate of speed as compered to a hose with a nozzle (factory Port) which will move less water but at a more compressed and higher speed.

I imagine keeping ports stock will keep the EGTs at a different rate too, , something to consider as well.

Edit: This seems to be mostly a concern for the turbo guys where they want quicker spool up times, NA guys like myself probably wouldn't give a shit, for the most part (the bigger the better lol)