I don't want a 4-2, I want a 4-1 so that rules out the zx14 exhaust. Also, the reason I want a full exhaust instead of just the can is that collector tubes on the stock exhaust are tiny, aftermarket like Area P is bigger. Check them out, they are smaller than the collectors on my '91 Katana 1100, look similar in size to those on my old GS550.A motor this big shouldn't have such small pipes, it is a restriction that needs to be rectified.
I understand. I've seen the AreaP (and other) headers compared to the stock/ZX14s. You are correct regarding size. Size .... ahhhh .... does matter here.
Couple things come to mind ... and I'm certainly not an expert here .... larger headers may flow more, but do they restrict lower rpm power... and, hence ... speed off the line? I don't know, but think someone suggested that this is true. That the larger diameter header tubes from after market will give better high end power, but will limit power off the line.
Also, if Dale has a header for the ZX14, I'm sure he can make a mid pip and add a can to do what you want, m'friend.