[rxspeed7]

^ kinda a bit off from normal logic, The main reason to leave ports alone is because og the actual port timing not the flow increase.

For a n/a application velocity is almost more important than flow gain(yes you want flow gain but you want the velocity to stay the highest) same goes for N/a intakes. Since you arent compressing the air into the motor you want it to enter and exit as fast as you can to pack more in.

For turbo applications velocity isnt as important cause your forcing air into the motor. You can make up for the slower velocity by adding more boost.With forced induction playing with the port timing can help tremendously on getting more air out and more in since your compressing it.

hope this maes sense. kinda hard to explain by typing.