i could take a picture side by side and then take measurements with a mircometer

http://www.mazdatrix.com/faq/cutaways.htm

that is only for the center though.

huh, well that is neat.

That's pretty cool. We'd still need to look at the end irons though for their passageways. I'm assuming that the center irons are pretty much the same for both thet NA and Turbo.

not necessarily. If there is enough of a difference in the casting of having or not having an EGR, then is a good chance they could have done something in the casting for the ports, especially since the turbo and non turbo may not share the same port timing.