I'm not sure ,but if you do any mods on your X keep us posted. It would be great to see what a port on a manifold will do. Are you planning to do the throttle body?
got to do some research to see what will fit the beast, and if Nissan makes it. it makes the transition easier than splicing connectors and hoping that it will work.
Extrudehone is extremely expensive. an average pair of cylinder heads are about $1000. and you have to send them out to get done. I can port the intake for my X in house with no delays.