I'm stuck here trying to make a decision. This was going to be my next 6 port turbo build, but I just got my hand on some good turbo II irons. I still will be using the high compression s5 rotors *yes i'm apparently insane*, but I wanted to know if anyone had any experience boosting the 6 port irons and the 4 port irons with na rotors. I am trying to figure out which will provide more flow. This question is what is going to set the stage for my next build. Hopefully you guys can help me out!!!

 

the biggest difference is the port timing.