I have a 13b six port that im setting up for drag. Im trying to get the most power out of it as possible. I wanted to get it ported and just learned that i can only go so far because its six port. Is it better to swap out for a four port 13b instead? Which can i get more power out of? I would really appreciate some help!!! Thanks

 

I'm pretty sure the 4 ports are turbo.

Use this to answer all your questions:
https://www.rx7club.com/search.php

 

Yes, even naturally aspirated 4 ports have been shown to make more power than 6 ports.

It is very hard to get a 6 port to over 200RWHP, but a 4 port mild streetport intake/race port exhaust on stock TII manifolds and a header can do it.

Highest NA dyno graph I have seen was 230rwhp out of an NA streetported Cosmo 13b.